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Mark Maslin is professor of natural sciences at University College London (UCL) and Iain Hanson is honorary professor at the Bartlett School of Sustainable Construction, UCL.

Many of us feel guilt when we fly because it is a very obvious source carbon emissions. Aviation causes around 2.5% of global greenhouse gas emissions. But we do not perhaps feel the same guilt when we walk into a new building, even though global concrete manufacture emits closer to 8%. Or when we jump in a petrol car or turn on our gas central heating.

This is because aviation is a very visible symbol of our high-carbon consumption and, until now, the aviation industry has been slow to engage with the climate change agenda. According to the UN, we are looking at global warming of up to just over 3˚C which would be disastrous for the planet and our societies.

Human-caused global warming has just nudged passed 1.5˚C. But science suggests that we could keep close to this temperature increase if we reduced global emissions by 45% by 2030 and reached net zero by 2050.

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Post-COVID, aviation continues to regroup and grow and is set to be a trillion dollar industry by 2030, but it is incredibly vulnerable to the effects of climate change. Clear air turbulence events in the North Atlantic have increased by 55% since 1979, and prominent incidents have resulted in deaths, serious injury and damage to aircraft.

Extreme weather events are not just confined to there, with extreme rains and flooding affecting Middle Eastern airports and snowfall crippling UK airports causing considerable disruption.

While aviation is a relatively small contributor to global emissions, the industry is predicted to grow at 4% per year for the foreseeable future. Without meaningful action, net zero by 2050 will never be achieved. New generations of technology coming on-stream are not yet proven nor implementable, and aviation needs to reduce its carbon footprint now.

These five key steps focus on not only decarbonisation but make aviation more sustainable while also improving operational efficiency and safety.

1. Optimise flight planning and airspace

Airlines already try to select the most fuel-efficient routes and altitudes using advanced flight planning systems, AI, and optimisation software. However, future route optimisation could reduce turbulence events and the production of contrails with associated radiative forcing, increasing comfort and safety for passengers as well as contributing positively to the environment.

Optimising aircraft separation and air traffic control flow management can prevent aircraft bunching up and arrival delays because planes are forced into holding patterns, waiting their turn to land at the airport, carrying and burning large amounts of fuel.

2. Make operations more sustainable

The latest generation of commercial aircraft utilises advanced aerodynamics and engine technology, which saves a significant amount of fuel and emissions from previous types.

Airlines must invest in modern fuel-efficient aircraft as their expansion plans evolve. In the meantime, they can retrofit existing aircraft to improve efficiency by adding winglets to reduce induced drag and introducing new aircraft cabins, which save weight to improve efficiency.

Airlines and airports can also optimise weight and centre of gravity by reviewing the distribution of cargo and passengers to maximise efficiency, as well as using renewable energy to replace auxiliary power units on the ground and improving noise and air quality.

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3. Switch to sustainable fuels

The biggest source of emissions within the aviation industry remains the burning of kerosene. Airlines need to transition from conventional to sustainable aviation fuels (SAF) over an agreed timescale with equitable access. SAFs cover a whole range of technology from biofuels derived from plants, animals or waste to synthetic fuels such as artificial kerosene.

Depending on which type of SAF is used, they could lower CO₂ emissions by 20–98% compared to conventional fuel. The quality, reliability and the supply of SAFs needs to be ensured and secured.

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4. Make airports more eco-friendly

Airports can become much more sustainable by using renewable energy, such as solar or wind energy, for airport operations, including powering the terminals and equipment. Renewable energy can be used for ground equipment and airplane support, by having electric airplane tugs, baggage loaders and catering trucks, for example.

It is possible to improve ground operations to reduce emissions such as minimising aircraft engine idling time during taxiing and using reduced engines for taxiing around the airport.

The industry has an exciting opportunity to design and develop the next generation of sustainable airports. There are 575 existing or new airport projects around the world at a total value of US$488 billion, (£395 billion) with many more planned over the next two decades.

5. Smart travel

The aviation industry can make passengers more sustainable by redefining the passenger experience from door to door, not just the time spent at the airport or on a plane. This could include luggage pickup from your home and incentives to use public transport to the airport.

Support to reduce luggage weight can be implemented by basic essentials (such as toiletries) or heavier equipment such as skis, ski helmets and golf clubs being provided at the end destination instead of everyone having to pack them.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

The post Five ways to make aviation more sustainable right now appeared first on Climate Home News.

Five ways to make aviation more sustainable right now

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Hurricane Helene Is Headed for Georgians’ Electric Bills

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A new storm recovery charge could soon hit Georgia Power customers’ bills, as climate change drives more destructive weather across the state.

Hurricane Helene may be long over, but its costs are poised to land on Georgians’ electricity bills. After the storm killed 37 people in Georgia and caused billions in damage in September 2024, Georgia Power is seeking permission from state regulators to pass recovery costs on to customers.

Hurricane Helene Is Headed for Georgians’ Electric Bills

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Amid Affordability Crisis, New Jersey Hands $250 Million Tax Break to Data Center

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Gov. Mikie Sherrill says she supports both AI and lowering her constituents’ bills.

With New Jersey’s cost-of-living “crisis” at the center of Gov. Mikie Sherrill’s agenda, her administration has inherited a program that approved a $250 million tax break for an artificial intelligence data center.

Amid Affordability Crisis, New Jersey Hands $250 Million Tax Break to Data Center

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Curbing methane is the fastest way to slow warming – but we’re off the pace

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Gabrielle Dreyfus is chief scientist at the Institute for Governance and Sustainable Development, Thomas Röckmann is a professor of atmospheric physics and chemistry at Utrecht University, and Lena Höglund Isaksson is a senior research scholar at the International Institute for Applied Systems Analysis.

This March scientists and policy makers will gather near the site in Italy where methane was first identified 250 years ago to share the latest science on methane and the policy and technology steps needed to rapidly cut methane emissions. The timing is apt.

As new tools transform our understanding of methane emissions and their sources, the evidence they reveal points to a single conclusion: Human-caused methane emissions are still rising, and global action remains far too slow.

This is the central finding of the latest Global Methane Status Report. Four years into the Global Methane Pledge, which aims for a 30% cut in global emissions by 2030, the good news is that the pledge has increased mitigation ambition under national plans, which, if fully implemented, could result in the largest and most sustained decline in methane emissions since the Industrial Revolution.

The bad news is this is still short of the 30% target. The decisive question is whether governments will move quickly enough to turn that bend into the steep decline required to pump the brake on global warming.

What the data really show

Assessing progress requires comparing three benchmarks: the level of emissions today relative to 2020, the trajectory projected in 2021 before methane received significant policy focus, and the level required by 2030 to meet the pledge.

The latest data show that global methane emissions in 2025 are higher than in 2020 but not as high as previously expected. In 2021, emissions were projected to rise by about 9% between 2020 and 2030. Updated analysis places that increase closer to 5%. This change is driven by factors such as slower than expected growth in unconventional gas production between 2020 and 2024 and lower than expected waste emissions in several regions.

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This updated trajectory still does not deliver the reductions required, but it does indicate that the curve is beginning to bend. More importantly, the commitments already outlined in countries’ Nationally Determined Contributions and Methane Action Plans would, if fully implemented, produce an 8% reduction in global methane emissions between 2020 and 2030. This would turn the current increase into a sustained decline. While still insufficient to reach the Global Methane Pledge target of a 30% cut, it would represent historical progress.

Solutions are known and ready

Scientific assessments consistently show that the technical potential to meet the pledge exists. The gap lies not in technology, but in implementation.

The energy sector accounts for approximately 70% of total technical methane reduction potential between 2020 and 2030. Proven measures include recovering associated petroleum gas in oil production, regular leak detection and repair across oil and gas supply chains, and installing ventilation air oxidation technologies in underground coal mines. Many of these options are low cost or profitable. Yet current commitments would achieve only one third of the maximum technically feasible reductions in this sector.

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Agriculture and waste also provide opportunities. Rice emissions can be reduced through improved water management, low-emission hybrids and soil amendments. While innovations in technology and practices hold promise in the longer term, near-term potential in livestock is more constrained and trends in global diets may counteract gains.

Waste sector emissions had been expected to increase more rapidly, but improvements in waste management in several regions over the past two decades have moderated this rise. Long-term mitigation in this sector requires immediate investment in improved landfills and circular waste systems, as emissions from waste already deposited will persist in the short term.

New measurement tools

Methane monitoring capacity has expanded significantly. Satellite-based systems can now identify methane super-emitters. Ground-based sensors are becoming more accessible and can provide real-time data. These developments improve national inventories and can strengthen accountability.

However, policy action does not need to wait for perfect measurement. Current scientific understanding of source magnitudes and mitigation effectiveness is sufficient to achieve a 30% reduction between 2020 and 2030. Many of the largest reductions in oil, gas and coal can be delivered through binding technology standards that do not require high precision quantification of emissions.

The decisive years ahead

The next 2 years will be critical for determining whether existing commitments translate into emissions reductions consistent with the Global Methane Pledge.

Governments should prioritise adoption of an effective international methane performance standard for oil and gas, including through the EU Methane Regulation, and expand the reach of such standards through voluntary buyers’ clubs. National and regional authorities should introduce binding technology standards for oil, gas and coal to ensure that voluntary agreements are backed by legal requirements.

One approach to promoting better progress on methane is to develop a binding methane agreement, starting with the oil and gas sector, as suggested by Barbados’ PM Mia Mottley and other leaders. Countries must also address the deeper challenge of political and economic dependence on fossil fuels, which continues to slow progress. Without a dual strategy of reducing methane and deep decarbonisation, it will not be possible to meet the Paris Agreement objectives.

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The next four years will determine whether available technologies, scientific evidence and political leadership align to deliver a rapid transition toward near-zero methane energy systems, holistic and equity-based lower emission agricultural systems and circular waste management strategies that eliminate methane release. These years will also determine whether the world captures the near-term climate benefits of methane abatement or locks in higher long-term costs and risks.

The Global Methane Status Report shows that the world is beginning to change course. Delivering the sharper downward trajectory now required is a test of political will. As scientists, we have laid out the evidence. Leaders must now act on it.

The post Curbing methane is the fastest way to slow warming – but we’re off the pace appeared first on Climate Home News.

Curbing methane is the fastest way to slow warming – but we’re off the pace

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