The number of global climate initiatives launched or run by China has been growing since 2009, a new study shows.
But whether this will translate into China taking up the mantle of climate leadership remains an “open question”, says Dr Sun Yixian, study co-author and professor of sustainability governance at the University of Bath.
Sun’s team has compiled a database tracking all global environmental initiatives established from the 1980s onwards that were launched or run by China.
These initiatives are either created by China or co-created with other governments, or have operations that are mainly managed by Chinese institutions.
They range from research cooperation and south-south climate funding to high-level policy signalling, such as joint statements on climate change.
In an interview with Carbon Brief, Sun discusses the key findings of the new “China’s Global Environmental Leadership” (CGEL) database.
He adds that it is not yet clear if the US withdrawal from the UN climate regime will change China’s role in global climate governance.
The conversation covers how the number of China-led initiatives has changed over time, what these projects look like and how China’s approach to climate “leadership” is changing.
The interview has been edited for length and clarity.
- Sun on the types of climate initiatives: “There are all different kinds of initiatives – we have these typologies of governance functions, including sharing information and building platforms, or developing capacity – capacity building activities, which can be training delivered by China to other countries. Or also by providing funding, for example.”
- On the rise in new climate initiatives: “From after 2009 and 2010, we’ve seen many initiatives – of course, more and more over the last 10 years, and even the last five years, from 2021…have been created.”
- On the impact of the Trump administration: “The shift of the US under the second Trump administration will probably help Chinese initiatives get more traction from their international partners…Whether or not this will translate into new initiatives or strengthen existing initiatives, I think that’s an open question.”
- On a growing focus on multilateral programmes: “What we have seen is a very clear upward trend of transnational initiatives with a global scope. That means they operate in more than two continents. So, in that sense, what we can see is, actually, China is moving from this bilateral engagement model to more kind of global engagement and trying to project its influence at the global scale.”
- On a climate leadership ‘mindset’: “[Leading Chinese experts] said the government, and also people in China, are not ready to become a global leader. But, at the same time…in climate governance, but also in clean-energy supply chains – China is playing a leading role. So, I think the question is whether this…will translate into the understanding, or mindsets, of people, including policymakers or decision-makers in the country.”
- On the future of China’s climate engagement: “My read is that China is willing to share more knowledge, and technology as well, through its international global engagements…But, at the same time, I think, it is not a given. It depends on how countries can make arrangements with China, how they can also propose viable solutions in terms of absorbing Chinese technologies.”
- On the future of multilateral climate negotiations: Multilateralism is a very important principle, championed in almost all the initiatives. That means China is not going to abandon multilateral processes. Also, we have done some work looking at the alignment of Chinese climate initiatives with existing UN institutions and frameworks, and we also see very close alignment.
Carbon Brief: Thank you for joining us, Yixian. Your team has compiled a database of China’s “environmental leadership”. What do you mean by leadership and what did you find in relation to climate change?
Sun Yixian: Thanks Anika, it’s great to speak to Carbon Brief. Leadership is a very contested concept in social science, or especially in international relations. This is why we were very cautious when we thought about the name of this dataset, but we thought it was a good way to capture what we’re trying to do.
In this project, what we are trying to look at is China’s role in global environmental governance – China’s shifting role, especially from a more passive participant in global governance processes to play a more proactive role in developing or managing its own initiatives on transnational or cross-border environmental governance.
So, [this includes] different environmental issues, but, of course, we found that climate change is a very important issue area. By leading, we are using the concept of governance – in a sense that we are looking at the initiatives where Chinese actors claim some authority over other audiences towards certain public goods. So, it’s trying to provide public goods, in different ways. We have come up with a typology of different governance functions, trying to look at what specific activities Chinese actors are doing, or what kind of public goods Chinese actors are delivering, to the audiences of different initiatives.
And by audience we mean…international actors. So, that means we are not interested in what China is doing domestically, but beyond its borders.
CB: Could you explain what some of these climate initiatives look like in practice?
SY: This is very important, because it sounds very abstract if we just talk about leadership. In practical terms, there are all different kinds of initiatives – we have these typologies of governance functions, including sharing information and building platforms, or developing capacity – capacity building activities, which can be training delivered by China to other countries.
Or also by providing funding, for example, China has created this south-south climate fund. It can also include research collaboration or producing knowledge – mainly between research institutes.
It can be traditional leadership activities, in the sense of developing certain international regulatory frameworks or rules or standards – we call this rulemaking and standard-setting. It can also be pilot projects. China sometimes can start to work directly with some international partners to trial new ideas and new practices – what we call direct actions.
These are the different types of leadership activities that we look at and we actually code each initiative that meets the criteria of our database according to this topology, to try to look at what [the Chinese government] are looking at.
Some initiatives can do multiple things at the same time…One example is the Global Energy Interconnection Development and Cooperation Organization [GEIDCO]. [This was] initially created by the State Grid of China to try to promote clean energy and energy interconnections.
This initiative will deliver different types of activities, including building the capacity of some developing countries on energy and electricity grids, and also, for example, developing an international platform – they have annual international meeting and a lot of information-sharing activities, and engagement at UN meetings, including at COP side-events, and also directly engaging with some international organisations.
So, this is an example of the type of leadership initiative that has been included in our database.
CB: And would you say that there’s one particular type of activity that dominates, in terms of China’s climate leadership? Or is it very evenly split against all of the different types?
SY: This is also one of the main findings in our work. In the first paper we published to highlight the key patterns from the dataset, we highlighted that there’s a very uneven distribution in terms of what China tries to deliver or to promote, itself, internationally on environmental governance.
There have been a lot of initiatives focusing on sharing information and building platforms and this is the most dominant category – across all environmental issues, but the same pattern applies to climate change.
In the first article we published in the Earth Systems Governance journal, we looked at the whole dataset, but we are also developing a few studies, currently under review. One paper particularly looks at climate initiatives and it’s the same pattern: information-sharing and networking.
At the same time, the least frequent or popular type is the provision of funding – creating some financing programmes to directly give funding to international partners. I think this reflects China’s position on environmental or climate finance, especially internationally.

[China’s] not trying just to provide money, but really think about how to support other countries on more practical, more pragmatic terms. This is why I think that after information-sharing, what we have seen is capacity-building activities, which have also been quite frequently used by Chinese initiatives when collaborating with their international partners. This also explains China’s logic to teach [others] how to develop things, but not just giving money.
The other important category is research collaboration and knowledge production. This has been mainly led by research institutes in China, such as the Chinese Academy of Sciences, especially with a strong focus on scientific co-production.
But, lately, we have also seen more and more initiatives focused on sharing knowledge not just about science itself, but sometimes also on the social sciences side – the experiences of China as a whole. China’s experiences can also be learned from by other countries, especially in the global south.
These are just some examples, but the overall pattern is [a focus on] information-sharing, capacity building and knowledge production and not too much on provision of funding.
CB: You mentioned the GEIDCO example earlier. How much of a tangible impact would you say a lot of these initiatives have? Are they very high-level, strategic and quite abstract? Or do they kind of result in programmes on the ground?
SY: That’s a very interesting question – the answer is that it really varies. GEIDCO, as you mentioned, is a very high-level initiative. I think, initially, the idea of energy interconnection was proposed by President Xi himself. Now, of course, GEIDCO, with the backing of the State Grid, does a lot of high-level [national planning] and trans-national [grid network] planning work with developing countries.
But, at the same time, there are also a lot of grounded, locally focused initiatives. A lot, for example, are co-developed between China – especially supported by the Ministry of Ecology and Environment [MEE] – and UNEP [United Nations Environment Programme] in, for example, Africa and Southeast Asia. [This includes] some projects looking at climate adaptation and resilience. But these are more small-scale projects.
So, in our database – and I welcome your readers to explore the database itself that you can see – there are a big variety of initiatives and their scope, their mission and their intended outcomes or impacts vary significantly.
But we are just providing this public resource. Hopefully, people can use it to further explore, for example, the question of the impact or outcome. At this stage, we’re not going to assess what has been delivered, but I think if we can take, for example, a case-study approach – trying to trace what has been done, what has been delivered – this could also be a very interesting research agenda.
CB: Is there a particular time from when China’s interest in engaging on climate change started, or has this been a very long-term process?
SY: In our database, we really wanted to capture the historical trend. That’s why we looked back from early on – [we focused on] from the beginning of this century, but also traced initiatives that had been created even earlier but became active in the 21st century.
So we can [see that,] already in the late 1980s or 90s, there were some initiatives in the area of climate change. But, most importantly, the majority of the initiatives were started after 2008, mainly in the 2010s. We can see a very clear upward trend. It was not shown directly in our recently published article, but it’s in the database and we have looked at the data and produced a graph for other studies we are currently developing.
Really, from after 2009 and 2010, we’ve seen many initiatives – of course, more and more over the last 10 years, and, even the last five years, from 2021, we still see more and more initiatives have been created.

This timeframe corresponds to China’s shifting international role, to move from [being] a more regional power, a large developing country, to a global superpower, and trying to project its influence globally.
That also correlates with, for example, the belt and road initiative and lately the global development initiative – China is trying to also use climate change in this broader policy framework and trying to promote and support climate action in different parts of the world.
CB: The database stops at 2024 – just before the current administration withdrew the US from the Paris Agreement. Have you noticed any changes in China’s global climate engagements following this?
SY: I would say the trend is a continuous one, even with the withdrawal of the US from the Paris Agreement and lately from the UNFCCC. Because, as I mentioned earlier, over the past 10 years, we have seen this upward trend, with more and more new initiatives created by Chinese actors.
But I think the shift of the US under the second Trump administration will probably help Chinese initiatives get more traction from their international partners – or countries or actors that haven’t been engaged very closely with China – to work more closely with China.
Whether or not this will translate into new initiatives or strengthen existing initiatives, I think that’s an open question.
We really want to explore [this] further. Something I didn’t mention earlier is we are publishing this data set as version one, we want to keep updating on a regular basis. We hope we’ll have versions two or three out, maybe every two years. We’ll see how things go, but I think this is a very important question.
CB: Looking at how China is engaging with all of these different countries – as you mentioned, more and more potentially wanting to work with it following the US’s withdrawal – do you get the sense that the Chinese government prefers to engage with countries bilaterally, on a one-to-one basis, or are they also engaging at the regional and multilateral levels?
SY: This is a great question. This is also an important finding from our work, because the conventional understanding is that China prefers to engage with countries bilaterally.
But, if we look at our database, what we can see is that, actually, China has developed more and more transnational initiatives – meaning that it also involves non-state actors or [works] beyond the traditional multilateral processes and [develops initiatives] with a global scope.
If we look at the historical trends, initially – especially up to 2010 – there were a lot of bilateral initiatives. Most cases in our database are bilateral initiatives.
But, lately, I think this trend is shifting. Still, I think there are many more bilateral initiatives than multilateral and transnational initiatives.
How we differentiate leadership activities of Chinese [state] actors across different levels [affects the trend], but, lately, what we have seen is a very clear upward trend of transnational initiatives with a global scope. That means they operate in more than two continents.
So, in that sense, what we can see is, actually, China is moving from this bilateral engagement model to more kind of global engagement and trying to project its influence at the global scale.
I think this is also quite interesting, to understand how not only the government, but also lots of Chinese actors – including, for example, businesses and civil society actors – are trying to project and their footprint globally.
And also I think this reflects a shifting global role of China, in general. We can further explore what the implications of this phenomenon are. This is some ongoing research I’m doing – trying to understand how actors in different parts of the world react or perceive this changing rule of China and how such engagement between China and different countries shape, or reshape, the sustainability transition.
CB: You mentioned just then that there’s not just the Chinese government, but also civil society, businesses and other non-state actors. What role do you think these non-state organisations play in the country’s overall climate strategy and climate engagement?
SY: Let me start with the caveat that, first of all, as shown in our database, the government, or state actors, still play a very important role – especially central government agencies, for example, the MEE [Ministry of Ecology and Environment] or NDRC [National Development and Reform Commission].
But, at the same time, especially over the last 10 years, what we have seen is that non-state actors have become more active and engaged more, in various ways, in leading climate initiatives beyond China’s borders.
This means, sometimes, they collaborate with state actors to co-develop certain initiatives. Sometimes, they develop their own initiatives with, of course, some support from the state. One thing we need to bear in mind is, in China, it’s almost impossible to [avoid involving] the state. At least, you have to closely align with the strategy of the government.
But, at the same time, what we can see is the agency of these actors. They have developed or showed the ambition to develop certain initiatives, including, for example, standards in the critical mineral space, to provide guidelines to companies for their overseas activities.
Similarly, some civil society actors, [such as] research institutes, also want to claim their leadership in a global sphere, trying to showcase how they can lead certain activities and show how their expertise or their knowledge can support countries or actors in other parts of the world.
CB: On the standards-setting point, is that something where it might be led by one Chinese company with multiple partners – whether it be from one country or from various different countries in a region? Or is it a broad spectrum of Chinese companies coming together saying that we want to work with Chile, Zimbabwe etc, on mining standards? Is it very representative of the industry, or does it tend to be quite piecemeal?
SY: This is an inclusion criteria for the databases. We [only] look at the initiatives that are, to a large extent, institutionalised. It’s not that company’s claim that “we are doing this”. If we can’t track down any information or find any records then we cannot include things like that in our database.
That means we only tend to look at initiatives that are well-developed. These are often, for example, developed by national industry associations. They try to convene different companies together and try to collaborate with, or coordinate, different actors along supply chains and also across sectors or industries.
When they work with different international partners, this is also a question I think we need to further explore, using our data set to try to look at – sometimes I think it’s not easy for us to do everything! – but try to look at what kind of partners they select and how they get involved with partners in different countries or different regions.
But I think this probably requires some other methodologies to look at, or maybe zoom out to specific cases.
This is similar – I always want to use this as a comparison – when we started [seeing] this phenomenon in Europe or in North America, for example, where companies start to take climate actions, we didn’t really pay a lot of attention to how and who they work with, as long as they say: “We are trying to support global climate action.”
But, nowadays, when it comes to the question of China, people start to be interested in who they work with. But if we look at the narrative and discourse of these initiatives, they say as well: “We want to support actions around the world.”
They don’t always specify [the geographic scope of their standard-setting work], but if we further zoom into where they are working and why they work in specific areas or regions, this is also an interesting question – I think there is also a question of politics or political economy there. I would encourage researchers to use our dataset to further explore that kind of question.
CB: Zooming back out – the theme of the data set is environmental leadership, but – at least in global climate negotiations – Chinese officials have eschewed being called a climate leader. Your database seems to show an uptick in activity that could be defined as leadership. Would you say that China wants to be seen as a climate leader?
SY: This is a very strong claim, so I probably would not say [so] – also, it’s very subjective, depending on who you ask this question to and how people perceive it.
Let me frame me this way – let’s separate multilateral negotiation processes from what the country or different actors are doing. Of course, for leadership, another way to measure this is to see the performance itself.
But, in the end, I think we also tried to be very reflective when we developed this work to acknowledge the subjectivity of leadership and the relational nature of leadership. That means that, if you want to be a leader, others need to acknowledge your leadership or recognise this status.
But this is why I think it comes to an interesting question about what’s the role of China and how different actors perceive China’s role in today’s global climate governance.
In multilateral negotiation processes, we are entering into the implementation phase for the Paris Agreement. That means it is very difficult to create new agendas at this stage. [Instead the focus is] trying to see if countries can deliver what they have done.
Of course, I think there is a question of ambition in terms of updating your nationally determined contributions. So, there is an ambition question – there is a performance question.
If we want to see whether China is becoming a leader, we have to look at how fast, for example, China is accelerating its energy transition, trying to reduce – of course, some data shows China has already peaked its emissions – but maybe, how fast China can reduce its emissions.
Then, in terms of international engagement, what our data is trying to show is that China has become more proactive in that space. The question is also if this engagement translates into some progress in different parts of the world – if China is actually helping. We need more data to do this kind of impact assessment.
But, at the same time, I think the question of whether the Chinese government wants itself to be seen as a leader – this is also an interesting question. Depending on who they want to engage with, in different fora or on different platforms, the answer may be different.
I just want to quote, when I was in China a few months ago, we had some dialogues with leading Chinese experts. They said the government – and also people in China – are not ready to become a global leader. But, at the same time, I think, what China is doing or the role of the country – in climate governance, but also in clean-energy supply chains – China is playing a leading role.
So, I think the question is whether this physical change that has already happened will translate into the understanding, or mindsets, of people, including policymakers or decision-makers in the country.
I think this is a question that China needs to figure out, itself. Then, of course, there will be implications for China’s strategy for engaging with the rest of the world, especially on climate change.
CB: And what do you think China’s climate engagements will look like in 5-10 years from now?
SY: I think, from an energy-transition perspective – let me start from there – China is going to be, at the least, more proactive in promoting energy transition, because it aligns with China’s economic interests and, to a certain extent, its political interest as well, to support energy transitions around the world.
The key question is what role China can play in doing that. Of course, there is the question of trade, of tariffs. There is also the question of investment, intellectual property and technology transfer.
My read is that China is willing to share more knowledge, and technology as well, through its international global engagements, to support other countries. But, at the same time, I think, it is not a given. It depends on how countries can make arrangements with China, how they can also propose some viable solutions in terms of absorbing Chinese technologies.
What we have seen is a lot of countries, especially in the global south, have benefited already, or are in the process of benefiting from, affordable technologies produced by China.
But, at the same time, this is not sustainable – at least from an economic point of view – not a sustainable situation in the sense that these countries also need to find a way to move themselves upward in supply chains and try to absorb some technologies. How they can work with China [to achieve this] – that’s a very important question to me and also my team. We want to do more research in that area.
This is from the energy-transition perspective. But then, if we look at multilateral processes, I would say China is very committed to multilateralism. If we look at all the discourse, including the cases in our database – we have done some text analysis looking at the narrative discourse of the vision of these initiatives. Multilateralism is a very important principle, championed in almost all the initiatives. That means China is not going to abandon multilateral processes.
Also, we have done some work looking at the alignment of Chinese climate initiatives with existing UN institutions and frameworks, and we also see very close alignment.
So, I think this pattern will probably last. At the same time, because – depending on the other important countries’ climate policies, for example, the US – back to your question about the leadership in multilateral processes, how proactive and how ambitious China wants to be in taking on this leadership position in multilateral processes is still an open question.
This also depends on the concept of leadership in different cultures.
Whether China wants to take over the US to become the only superpower of a global system – I think this is probably very unlikely. China may want to figure out a slightly different model. Even if, physically, it’s one of the most, or the most, important or powerful countries in the world, how using how the country can use this position to support or guide the governance of global challenges, this is probably slightly different from the views or understanding of, for example, European and other global north countries.
The question is how China can propose a slightly different model – still in the current multilateral system – for governing global challenges, including climate change. This is really important. I don’t have an answer, so that’s why we will continue to look at this question and try to use our research to help people understand what role China can play in global climate governance.
CB: Thank you.
This interview was conducted by Anika Patel via Zoom on 1 July 2026.
The post Interview: Dr Sun Yixian on his new database tracking Chinese climate ‘leadership’ appeared first on Carbon Brief.
Interview: Dr Sun Yixian on his new database tracking Chinese climate ‘leadership’
Climate Change
Every country needs a model to help optimise its energy transition
Claver Gatete is Executive Secretary of the UN Economic Commission for Africa. Jason Veysey is Energy Modeling Program Director and Senior Scientist at the Stockholm Environment Institute. Lisa Sachs is Director of the Columbia Center on Sustainable Investment at Columbia University.
The case for global energy transition has rarely been clearer. The closure of the Strait of Hormuz earlier this year exposed the cost of unplanned, fossil-dependent systems, while the falling cost of renewables, the rising penetration of electric vehicles, and the growing value of demand flexibility have made the direction of travel obvious. The benefits of a clean, secure, integrated system are no longer in dispute. What remains unclear is how to build it.
Countries around the world have called for faster renewable energy deployment and alternative energy arrangements. A secure, affordable, resilient, decarbonised system requires specific investments in specific places in a specific sequence, optimised across sectors and borders. But very few governments have the analytical foundation to translate those imperatives into investment.
The two instruments that are supposed to determine investment priorities for decarbonisation – Nationally Determined Contributions (NDCs) and country platforms – cannot answer the most basic question facing any country undertaking an energy transition: what should the energy system look like?
To close this gap, every country needs a bankable, economy-wide optimisation model for its energy system. A model is not a plan, but it can help answer the critical question of what the future energy system should look like. It shows how optimal scenarios vary as assumptions and policies are adjusted, calculates investment requirements and sequencing, and quantifies how system costs are affected by assumptions, policies, and exogenous variables like trade policy and financing terms.
Tool for efficient investment
Optimisation is a simplified way of simulating an energy system, but it can be an extremely powerful tool for moving energy planning from reactive (how do we manage the disparate actions in the energy system?) to intentional (what energy system underpins our national objectives?). A model can show how optimal scenarios vary as assumptions and policies are adjusted, and how investment requirements are quantified and sequenced.
Optimisation models can treat the energy system and the sectors it serves as an integrated whole, optimising across sectors and projects in ways that can be mutually reinforcing. If considered independently, growth in industrial demand, transport electrification, and digital infrastructure can add stress to the energy system. But an optimised plan can arrange these and other changes in an efficient, synergistic way.
Two to tango: How governments can unlock private investment for national climate goals
New load can be added where low-cost power is available; industrial customers can ensure the viability of investments in energy supply; electric vehicle charging policy can smooth load curves and reduce costs for all consumers.
Additionally, optimisation modeling can also change the financeability of investments. Taken alone, each project faces uncertainty about the rest of the system, which raises the cost of capital and causes projects to stall or unwind after contracts are signed. A coherent, optimised plan makes visible the coordination that private capital would otherwise have to bet on: identified offtake, sequenced and committed transmission, contracted power supply, and so on.
What COP31 and COP32 should do
The upcoming COPs in Turkey and Ethiopia can shift the center of gravity of international climate cooperation from fragmented commitments to planning. Three moves are urgently needed.
First, optimised, economy-wide, long-term energy system planning must be the foundation on which any meaningful NDC, country platform, or finance commitment rests. NDCs are typically drafted by environment or single-line ministries, with limited cross-sectoral input from ministries of energy, finance, and planning. They contain targets, derived from sectoral strategies or national commitments, not from an analytically grounded picture of what the energy system should look like and what investments would make it work. Country platforms are generally a portfolio of investments assembled from existing project pipelines, rather than derived from a system-level analysis of what an optimised, decarbonised energy system would require.
Second, recognise regions as a key planning unit. Modern integrated energy systems are inherently regional. Renewable endowments are unevenly distributed; balancing variable supply across borders lowers aggregate cost, reduces redundant backup capacity, and unlocks economies of scale no individual nation can achieve. Many energy investments in Southeast Asia, East Africa, Southern Africa and Central Asia may only be financeable in a regional context. Assessing domestic infrastructure without regional optimisation perpetuates the perception that decarbonisation is more expensive than it is.
COP31 leaders unveil global targets, with spotlight on electrification
Third, finance the planning capacity. A coordinated commitment by multilateral development banks, bilateral donors, and philanthropic partners to help every region and its constituent countries develop and maintain their own modelling capability, with open-source tools and regional analytical hubs, would close the most consequential gap in the current architecture. The cost is small relative to current spending on country platforms, failed project preparation, and misallocated infrastructure investment.
This includes supporting regional institutions such as the ASEAN Centre for Energy, the African Energy Commission, regional power pools, and the Latin American and Caribbean Energy Organization to determine what optimised regional systems require. Country-by-country pledging, repeated at every COP, will not deliver what meaningfully integrated systems can.
The 2026 energy crisis made the cost of unplanned, fossil-dependent systems newly visible. That window of clarity will close. The international community should seize the moment to build the planning foundation that has been missing for thirty years, rather than commissioning another round of NDCs or pledges, striving for outcomes neither was designed to deliver.
The post Every country needs a model to help optimise its energy transition appeared first on Climate Home News.
Every country needs a model to help optimise its energy transition
Climate Change
Explainer: How the ‘super El Niño’ will reshape the world’s weather
The world is currently experiencing what is expected to become the strongest El Niño on record – dubbed a “super El Niño” by many.
El Niño is the warm phase of a recurring climate pattern in the tropical Pacific that releases heat from the ocean into the atmosphere.
This temporarily raises global temperatures and reshapes rainfall and extreme weather around the world – impacting the lives of billions of people.
The current El Niño event began in June and is expected to last into 2027.
El Niño is part of a wider climate pattern called the El Niño-Southern Oscillation (ENSO) cycle.
The ENSO cycle also has a cool phase, known as La Niña, as well as a “neutral” phase. El Niño and La Niña events typically last between nine and 12 months, but can go on longer.
Below, Carbon Brief explains how the ENSO cycle works, its impacts on extreme weather and global temperatures and why this El Niño event is projected to be the most intense since records began.
The post Explainer: How the ‘super El Niño’ will reshape the world’s weather appeared first on Carbon Brief.
https://interactive.carbonbrief.org/el-nino-explainer/index.html
Climate Change
Analysis: The two largest reservoirs in the US have hit record-low levels
The second-largest reservoir in the US reached a record-low water height on Saturday – just days after the country’s largest reservoir broke its own record.
Both Lake Mead and Lake Powell are located on the Colorado River.
They provide water for populations across seven US states in the south-western US, with around 40 million people getting some or all of their municipal water from the Colorado River.
The river also provides water for around 5.5m acres (22,258 square kilometres) of farmland across Colorado, Arizona, California and the other states in the river basin.
Experts tell Carbon Brief that climate change, population growth and over-consumption are all contributing to the current record-low levels of the reservoirs.
Record lows
At full capacity, Lakes Mead and Powell can hold a combined 68 cubic kilometres of water – enough to supply all household consumption in the contiguous US for nearly 1.5 years. However, the water level in both reservoirs has been declining for decades.
The chart below shows the water level of Lake Mead, in metres above mean sea level. The reservoir, which began to fill in 1935 following the construction of the Hoover Dam, has a “full pool” maximum capacity of 347.60 metres. The water level in Lake Mead reached a record low of 317.11 metres on 7 August.

The following chart shows the water level of Lake Powell, in metres above mean sea level. Lake Powell’s full-pool level is 1,127.76 metres.
While the reservoir reached its maximum capacity several times in the 1980s, it has not done so since. On 15 August, the water level in Lake Powell was recorded at a new record-low of 1,072.87 metres.

Both reservoirs have continued to decline in the days since breaking their respective records. The downward trend will largely continue in both lakes until next spring, when the snowpack in the mountains of the Upper Colorado River Basin begins to melt, says Dr Jack Schmidt, a senior research scientist at Utah State University’s Center for Colorado River Studies. He tells Carbon Brief:
“The big dilemma of the moment is that we’re only in the middle of August, and we have no assurance of what the coming winter will be. The only thing we can be sure of is that we will be depleting overall total basin reservoir storage from now until, roughly, early April.”
Compounding factors
The record lows across the two reservoirs are the result of several compounding factors, experts tell Carbon Brief.
Since the turn of the 20th century, the amount of water flowing along the Upper Colorado River has declined by about 20%. Research suggests that half of this decline can be attributed to human-induced climate change.
Most of the river’s streamflow comes from the snowpack of the Upper Colorado River Basin, which stretches across five western US states but is primarily located in Colorado and Utah.
This region has been gripped by a historic “megadrought” for more than a quarter of a century. Nearly half of the megadrought’s intensity over 2000-18 is attributable to climate change, according to a 2020 study.
At the same time, the increasing population in the US south-west has put added pressure on the Colorado River’s water supply. The number of people obtaining some or all of their water from the Colorado system has grown by 15 million (around 60%) since 1992.
Schmidt tells Carbon Brief:
“There’s an ultimate cause of the present water crisis, and there’s a proximate cause. The ultimate cause is a warming climate, a warming planet and a pretty clear correlation between warming conditions and decreased runoff in the Colorado River Basin.
“The proximate cause is that in this messy democratic republic of ours, big policy decisions that match the variability of the climate occur painfully slowly – with intense political negotiations – and only incrementally.”
On 31 July, the US Bureau of Reclamation, which manages water resources in the western US, released an environmental impact statement on its proposed post-2026 strategy for managing Lakes Powell and Mead. The strategy itself has not been released yet.
Schmidt notes that the statement does appear to give the Bureau flexibility to “respond to crisis” by reducing the delivery of water to several states. However, he adds:
“They acknowledge it won’t work if we just stay critically dry, and of course every climate model for the 21st century, especially with a continually warming planet, says that that’s exactly what’s going to happen.”
The post Analysis: The two largest reservoirs in the US have hit record-low levels appeared first on Carbon Brief.
Analysis: The two largest reservoirs in the US have hit record-low levels
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