The Republican candidate Donald Trump has been elected as the 47th US president, beating his Democratic opponent Kamala Harris in a “historic comeback”.
In response, climate scientists, researchers and experts have expressed concern about his election’s impact on efforts to tackle climate change.
During his first term in 2017-2021, Trump – a climate sceptic – rolled back climate regulations and pulled the US out of the Paris Agreement, a move he has promised to repeat.
He continued to attack climate action and science throughout his campaign in the run-up to the 5 November election. He lent heavily on his mantra of “drill, baby, drill”, as well as announcing he wanted to “terminate” spending on what he calls the “green new deal” – understood to be a reference to 2023’s landmark Inflation Reduction Act.
Trump’s election could lead to an additional 4bn tonnes of carbon dioxide equivalent (GtCO2e) of US emissions by 2030, compared to continuing current-president Joe Biden’s plans, Carbon Brief analysis found earlier this year.
Carbon Brief has asked a range of scientists, policy experts and campaigners from around the world what they think a Trump presidency could mean for climate action.
These are their responses, first as sample quotes, then, below, in full:
- Katharine Hayhoe: “‘Every action matters’…[so] despite the coming headwind, it’s more vital than ever to continue striving.”
- Jason Bordoff: “Among the most consequential impacts of a second Trump term on climate action will be regarding the Inflation Reduction Act.”
- Joeri Rogelj: “Political decisions that disregard evidence…will be harshly course-corrected by the hard physical reality of climate change.”
- Li Shuo: “Trump’s win is no doubt bad news for US climate action…Other countries will need to step up.”
- Mo Adow: “Ultimately no one can run from the climate crisis, not even Donald Trump.”
- Alden Meyer: “Both domestic climate policy and multilateral cooperation are facing a time of extreme uncertainty and stress.”
- Navroz K Dubash: “It is critical that the world not bend backwards to try and mould the climate regime around the vagaries of US political currents.”
- Camilla Born MBE: “There is now a significant vacuum to fill to inspire confidence, shape markets and maximise the opportunities the transition brings.”
- Tasneem Essop: “The climate movement will be defiant and continue fighting.”
Katharine Hayhoe
Chief scientist of the Nature Conservancy and distinguished professor
Texas Tech University
As a lead author for the National Climate Assessment during the previous Trump administration, I’ve personally witnessed how federal decisions can impact climate action.
Some decisions are highly visible, like rolling back legislation, removing environmental protections and pulling out of global treaties. However, quieter and more behind-the-scenes decisions that restrict scientists’ access to data, limit research and funding and discourage public communication of critical findings can be equally chilling.
It’s essential to remember that action doesn’t rely solely on federal action. While policies such as the Inflation Reduction Act provide critical momentum, progress can and must happen at all levels: cities, states, businesses, organisations and more.
This election, for example, climate- and nature-positive ballot initiatives were passed in more than a dozen states. Groups such as the US Climate Alliance, Climate Mayors and America Is All In represent nearly two-thirds of the US. And organisations like the Nature Conservancy remain dedicated to implementing effective solutions for a safer, healthier and more just future.
Science is clear that “every action matters”. That’s why, despite the coming headwind, it’s more vital than ever to continue striving for a resilient future for people and nature. It’s not about saving the planet: it’s about saving us.
Jason Bordoff
Founding director
Center on Global Energy Policy at Columbia University’s School of International and Public Affairs
Domestically, among the most consequential impacts of a second Trump term on climate action will be regarding the Inflation Reduction Act (IRA). President Trump has been critical of the IRA, vowing to rescind unspent IRA funds and end EV tax credits. Particularly with the possibility of Republican control of Congress, there may be more legislative ability to roll back parts of the IRA. At the same time, given that we have seen bipartisan support for parts of the IRA in Republican-leaning states because of the investments being generated, I could see a scenario where some of the IRA’s domestic manufacturing provisions remain in place.
Additionally, we could see some expansion of clean-energy generation capacity in the Trump administration, particularly nuclear energy, for which Trump has voiced support. This would come at a time when some of America’s largest tech companies are actively looking to invest in nuclear and other forms of clean, firm power generation to meet the rapidly growing energy needs of artificial intelligence. Given growing tensions between the US and China, Republicans and Democrats should both be able to agree that it is in America’s economic and security interests to maintain our leadership position in AI.
Internationally, Trump quite notably withdrew the US from the Paris Agreement in the first days of his first term in office and has pledged to do so again if re-elected. On top of that, he has also said he plans to withdraw the US from the UN Framework Convention on Climate Change, a potentially more impactful move that, if successful, would remove the US from participating in COP negotiations and global climate cooperation more broadly.
Joeri Rogelj
Director of research at the Grantham Institute
Imperial College London
Irrespective of how one aligns politically, the case for pursuing a thriving low-carbon economy has never been stronger, both scientifically and economically. Scientifically, we understand how the extreme weather we have seen over the past years is of our own making, a result of the world’s greenhouse gas emissions.
We also understand that these impacts will become unacceptable and unmanageable with unchecked climate change. Meanwhile, clean renewable energy that generates high-quality jobs has become the economically sane choice in many countries. Political decisions that disregard evidence are putting us on societal dead-end streets that will be harshly course-corrected by the hard physical reality of climate change catching up.
Li Shuo
Director of China Climate Hub
Asia Society Policy Institute
Trump’s win is no doubt bad news for US climate action. It will also have a spillover effect for global climate politics, casting a shadow over COP29. Other countries will need to step up to fill the leadership gap. The EU and China will need to be critical partners in this endeavour.
Trump’s win will not change the global green transition. Green energy is becoming cheaper and more competitive. This economic trend, not politics, will lead action from now on.
I expect countries, including China, to reaffirm their commitments to the Paris Agreement at the start of COP29. Their resolve to manage the climate finance debate in Baku will be the earliest test of the resilience of the climate regime. Unlike 2016, the global community is prepared.
I am confident we will weather the immediate impact, but I am worried about the long-term implications of this election.
Mo Adow
Founding director
Power Shift Africa
Ultimately, no one can run from the climate crisis, not even Donald Trump. Extreme weather is killing people, economies and livelihoods are being wrecked, the science is clear, and the solutions are known. The rest of the world won’t just stand by and let one man’s ignorance ruin the home we all share.
Climate action is not a wall where if you remove one brick it falls down. It is like a trampoline with many springs. If you take one out, others can bear the load. The impetus for climate action over the next four years will not come from the politics of the White House, it will come from the economics of clean energy, from Europe, emerging markets and sub-national actors in the US and around the world.
For Africa, this is an opportunity to step up and fill the void left by the US presidency. Africa has vast renewable energy potential combined with the moral authority of being victims of climate harm but not perpetrators. With the right investment from other countries, African nations can demonstrate how it’s possible to break the link between development and fossil fuels and raise up a continent of climate champions to showcase the power of clean energy.
Alden Meyer
US lead for the International Climate Politics Hub and senior associate
E3G
While we don’t know exactly what policies President-elect Trump will pursue on the domestic or global stage, both domestic climate policy and multilateral cooperation are facing a time of extreme uncertainty and stress, given his statements on expanding oil and gas production, withdrawing from the Paris Agreement and rolling back key climate and clean energy measures.
Any retreat from progress would be a significant mistake. As the mounting impacts of climate-related disasters make abundantly clear, the world needs to accelerate climate action. And such action is advantageous for the US – for our economy, our energy security and for our foreign policy interests.
In a few days, representatives from 197 countries as well as a delegation of US governors, mayors, corporate CEOs and civil society leaders will travel to Baku to advance the crucial work of climate cooperation. COP29 has both the opportunity and obligation to drive forward progress on scaling up climate finance, transitioning from polluting fossil fuels to cleaner, more secure energy sources and building greater resilience to mounting climate impacts.
Navroz K Dubash
Professor of public and international affairs
Princeton University
Trump has called climate change a “hoax” and supports fossil fuel expansion. His election as president of the richest and most technologically capable country with the greatest responsibility for cumulative emissions cannot but set back the fight against climate change.
But it is also true that the problem goes deeper than an individual president. For example, because of the divided polity in the US and its political system of multiple “veto points”, the world’s largest historical emitter finds it impossible to appropriate essential public funds for climate finance, under any president. This contributes to simmering feelings of global climate injustice.
Which is why, at climate negotiations, it is critical that the world not bend backwards to try and mould the climate regime around the vagaries of US political currents, nor press pause on building out critical elements of the climate regime.
Meanwhile, our friends in the US will need to take defensive measures at home by, for example, doubling down on action in US states (again!). And by mobilising political support from beneficiary Republican states to maintain clean energy technology subsidies.
Failing this, the US public may well find that a Trump-induced sabbatical from the clean-energy race (which they are by no means winning even now) may cost them dearly in foregone jobs and competitiveness in technologies of the future.
Camilla Born MBE
Independent climate advisor and former UK senior official at COP26
In a word, the biggest impact Trump’s election has on climate action is on “confidence”.
We are in a different world than we were the first time around and there are many more equities invested in the transition. People are making money, doing jobs and cutting their bills because of clean energy and technology. And after Russia’s invasion of Ukraine, there is a growing recognition that fossil fuel dependency is risky and not consistent with security.
But for those on the fence, still making choices, the confidence dent could slow or knock their transition off course. This is potentially particularly true in emerging and developing economies where the transition is less mature.
Having said that, the other major difference this time is that China is so heavily politically and economically invested in the transition and they will want to maintain and grow export markets for their low-carbon tech.
There’s no doubt a strong and climate-positive US voice on the international stage helps immensely, there is now a significant vacuum to fill to inspire confidence, shape markets and maximise the opportunities the transition brings.
Tasneem Essop
Executive director
Climate Action Network-International
The climate crisis doesn’t care who is in the White House. If President Trump’s last time in office was anything to go by, there will be chaos and mayhem, but the climate movement will be defiant and continue fighting. The rest of the world will continue working.
Working together to address the climate crisis is in every nation’s self-interest. The impacts of climate know no boundaries and are felt across the world, including in the US. Nearly 200 countries carried on working on climate during the first Trump presidency – collaborating with many US states and cities – and we fully expect that to carry on.
The US is still in the climate battle. The energy transition is inevitable and accelerating in many countries and across the US, regardless of who is in power. If Trump steps out of the global clean energy race, they will be the losers. First-mover countries will be the winners. Trump can withdraw from the Paris Agreement, or the UNFCCC as a whole, at his own peril. The US will lose its ability to influence the decisions that will change the trajectory of the world’s economic development.
While the news that Trump plans to leave the Paris Agreement could cause initial anxiety at COP29, the world’s majority recognises that climate action does not hinge on who is in power in the US, and as we saw before and will see again, other countries will step up if the US reneges on their responsibilities and stands back. But the US will still be held accountable, by their own citizens as well as by governments and people across the world.
The Trump administration also cannot think that it can leave the Paris Agreement, and still come to climate meetings and obstruct progress. We will not allow this obstruction even if the US stays in the Paris Agreement.
The post Experts: What does a Trump presidency mean for climate action? appeared first on Carbon Brief.
Experts: What does a Trump presidency mean for climate action?
Drought and heatwaves occurring together – known as “compound” events – have “surged” across the world since the early 2000s, a new study shows.
Compound drought and heat events (CDHEs) can have devastating effects, creating the ideal conditions for intense wildfires, such as Australia’s “Black Summer” of 2019-20 where bushfires burned 24m hectares and killed 33 people.
The research, published in Science Advances, finds that the increase in CDHEs is predominantly being driven by events that start with a heatwave.
The global area affected by such “heatwave-led” compound events has more than doubled between 1980-2001 and 2002-23, the study says.
The rapid increase in these events over the last 23 years cannot be explained solely by global warming, the authors note.
Since the late 1990s, feedbacks between the land and the atmosphere have become stronger, making heatwaves more likely to trigger drought conditions, they explain.
One of the study authors tells Carbon Brief that societies must pay greater attention to compound events, which can “cause severe impacts on ecosystems, agriculture and society”.
Compound events
CDHEs are extreme weather events where drought and heatwave conditions occur simultaneously – or shortly after each other – in the same region.
These events are often triggered by large-scale weather patterns, such as “blocking” highs, which can produce “prolonged” hot and dry conditions, according to the study.
Prof Sang-Wook Yeh is one of the study authors and a professor at the Ewha Womans University in South Korea. He tells Carbon Brief:
“When heatwaves and droughts occur together, the two hazards reinforce each other through land-atmosphere interactions. This amplifies surface heating and soil moisture deficits, making compound events more intense and damaging than single hazards.”
CDHEs can begin with either a heatwave or a drought.
The sequence of these extremes is important, the study says, as they have different drivers and impacts.
For example, in a CDHE where the heatwave was the precursor, increased direct sunshine causes more moisture loss from soils and plants, leading to a drought.
Conversely, in an event where the drought was the precursor, the lack of soil moisture means that less of the sun’s energy goes into evaporation and more goes into warming the Earth’s surface. This produces favourable conditions for heatwaves.
The study shows that the majority of CDHEs globally start out as a drought.
In recent years, there has been increasing focus on these events due to the devastating impact they have on agriculture, ecosystems and public health.
In Russia in the summer of 2010, a compound drought-heatwave event – and the associated wildfires – caused the death of nearly 55,000 people, the study notes.
The record-breaking Pacific north-west “heat dome” in 2021 triggered extreme drought conditions that caused “significant declines” in wheat yields, as well as in barley, canola and fruit production in British Columbia and Alberta, Canada, says the study.
Increasing events
To assess how CDHEs are changing, the researchers use daily reanalysis data to identify droughts and heatwaves events. (Reanalysis data combines past observations with climate models to create a historical climate record.) Then, using an algorithm, they analyse how these events overlap in both time and space.
The study covers the period from 1980 to 2023 and the world’s land surface, excluding polar regions where CDHEs are rare.
The research finds that the area of land affected by CDHEs has “increased substantially” since the early 2000s.
Heatwave-led events have been the main contributor to this increase, the study says, with their spatial extent rising 110% between 1980-2001 and 2002-23, compared to a 59% increase for drought-led events.
The map below shows the global distribution of CDHEs over 1980-2023. The charts show the percentage of the land surface affected by a heatwave-led CDHE (red) or a drought-led CDHE (yellow) in a given year (left) and relative increase in each CDHE type (right).
The study finds that CDHEs have occurred most frequently in northern South America, the southern US, eastern Europe, central Africa and south Asia.
Threshold passed
The authors explain that the increase in heatwave-led CDHEs is related to rising global temperatures, but that this does not tell the whole story.
In the earlier 22-year period of 1980-2001, the study finds that the spatial extent of heatwave-led CDHEs rises by 1.6% per 1C of global temperature rise. For the more-recent period of 2022-23, this increases “nearly eightfold” to 13.1%.
The change suggests that the rapid increase in the heatwave-led CDHEs occurred after the global average temperature “surpasse[d] a certain temperature threshold”, the paper says.
This threshold is an absolute global average temperature of 14.3C, the authors estimate (based on an 11-year average), which the world passed around the year 2000.
Investigating the recent surge in heatwave-leading CDHEs further, the researchers find a “regime shift” in land-atmosphere dynamics “toward a persistently intensified state after the late 1990s”.
In other words, the way that drier soils drive higher surface temperatures, and vice versa, is becoming stronger, resulting in more heatwave-led compound events.
Daily data
The research has some advantages over other previous studies, Yeh says. For instance, the new work uses daily estimations of CDHEs, compared to monthly data used in past research. This is “important for capturing the detailed occurrence” of these events, says Yeh.
He adds that another advantage of their study is that it distinguishes the sequence of droughts and heatwaves, which allows them to “better understand the differences” in the characteristics of CDHEs.
Dr Meryem Tanarhte is a climate scientist at the University Hassan II in Morocco, and Dr Ruth Cerezo Mota is a climatologist and a researcher at the National Autonomous University of Mexico. Both scientists, who were not involved in the study, agree that the daily estimations give a clearer picture of how CDHEs are changing.
Cerezo-Mota adds that another major contribution of the study is its global focus. She tells Carbon Brief that in some regions, such as Mexico and Africa, there is a lack of studies on CDHEs:
“Not because the events do not occur, but perhaps because [these regions] do not have all the data or the expertise to do so.”
However, she notes that the reanalysis data used by the study does have limitations with how it represents rainfall in some parts of the world.
Compound impacts
The study notes that if CDHEs continue to intensify – particularly events where heatwaves are the precursors – they could drive declining crop productivity, increased wildfire frequency and severe public health crises.
These impacts could be “much more rapid and severe as global warming continues”, Yeh tells Carbon Brief.
Tanarhte notes that these events can be forecasted up to 10 days ahead in many regions. Furthermore, she says, the strongest impacts can be prevented “through preparedness and adaptation”, including through “water management for agriculture, heatwave mitigation measures and wildfire mitigation”.
The study recommends reassessing current risk management strategies for these compound events. It also suggests incorporating the sequences of drought and heatwaves into compound event analysis frameworks “to enhance climate risk management”.
Cerezo-Mota says that it is clear that the world needs to be prepared for the increased occurrence of these events. She tells Carbon Brief:
“These [risk assessments and strategies] need to be carried out at the local level to understand the complexities of each region.”
