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Engineering is at the heart of all our lives, and all areas of engineering must now be defined by our legal obligation to achieve a zero emissions society by 2050.

The ever-growing world economy is hungry for energy and materials but is powered by fossil fuels, which release greenhouse gases that lead to dangerous climate change.

There are two main sets of solutions: develop technologies to deliver clean energy, acting on the supply side of the problem; and reducing our demand for energy and materials, by identifying and implementing resource efficiency measures.

Supply-side solutions such as renewable energy and carbon capture and storage cannot deliver rapidly enough and at sufficient scale to provide the levels of mitigation agreed by national laws and international declarations. These techno-optimistic options rely on an unrealistic rate of innovation and fail to grasp the urgency of the climate crisis.  Read Absolute Zero for more information on this.

Therefore, the implementation of resource efficiency measures must be a primary ingredient of any mitigation strategy. From developing technologies to increase the material efficiency of key manufacturing processes, to evaluating the impact of measures such as reducing the size of cars or increasing the lifetime of buildings, research is required to understand how demand-side options can deliver the greatest benefit.

The Use Less Group is based in the Department of Engineering at the University of Cambridge and is led by Julian Allwood, Professor of Engineering and the Environment and Fellow of the Royal Society of Engineering. The group pursues world-leading research into the sustainable use of materials, energy and resources. We are funded by EPSRC, UKRI and industry partners.

 

Latest News

The only way to hit net zero by 2050 is to stop flying

The UK aviation industry this week promised to bring its net carbon emissions down to zero by 2050 while growing by 70 per cent, and Prime Minister Boris Johnson boldly predicted that “viable electric planes” would be available in just a few years. But past experience with innovation in aviation suggests that such ambitious targets are unrealistic and distracting. The only way the UK can get to net zero emission aviation by 2050 is by having a substantial period of no aviation at all. Let’s stop placing impossible hopes on breakthrough technologies, and try to hit emissions targets with today’s technologies. Our recent report “Absolute Zero” draws on work at six British universities to explain how. There are three ways to deliver net-zero aviation: invent new electric aircraft, change the fuels of existing aircraft or take the emissions out of the atmosphere. Electric planes already fly. Solar Impulse 2, powered by solar cells flew one person round the world in 2016, but slow progress in photovoltaics mean this is unlikely to scale up. Demonstrations of short battery-powered flights with a few passengers will soon begin. However, the technology is in its infancy and aerospace is, rightly, a highly regulated industry. Commercial long-haul electric flights will not be operating at any significant scale by 2050. Alternative fuels, such as hydrogen or synthetic kerosene, only deliver zero emissions flight if their production is powered by renewable electricity. Right now, green sources supply about 15 per cent of the world’s primary energy consumption. Over the next 30 years, while road vehicles, heating and industry are being electrified, there is unlikely to be spare clean power to make aviation fuel. Finally, there are currently no meaningful negative emissions technologies. It requires more energy to recapture carbon dioxide from the atmosphere than was generated when it was released. Using renewable electricity to power carbon capture rather than to displace fossil fuels does not create a net reduction. And tree planting only goes so far: we must increase the total area of forest in perpetuity to produce a one-off reduction in atmospheric carbon dioxide. So the commitment to net zero aviation by 2050 is really a commitment to zero aviation. Rather than hope new technology will magically rescue us, we should stop planning to increase fossil-fuel flights and commit to halving them within 10 years with an eye toward phasing them out entirely by 2050. Taxing aircraft fuel at the level of the UK’s current road fuel tax would be a useful first step: I estimate that it would make flights up to four times more expensive. Climate policy announcements so far have failed to account for the limited rate at which new technologies can reach significant scale. Fifty years after the Danes began developing wind turbines, they contribute just 2 per cent of world primary energy. Regardless of prices or incentives, new energy generation, transport and industrial processes require public consultation on regulations, land use, funding, environmental impacts and more. This all slows down their adoption. We should embrace this reality and focus on innovations that are compatible with a zero-emissions future. Video-conferencing software cuts the need for travel but is undeveloped. Average car weight has risen steadily since 1990 and could be halved. Scrap steel is collected with little sorting and recycled into low-grade products, but it could be upcycled in renewable powered furnaces. Bold announcements of “net-zero” targets by sunset industries such as fossil-fuel aviation cause confusion and delay the policies required to phase them out. They also distract us from innovations that can be implemented rapidly and buy us the time we need to develop real zero-emissions options.

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Working with the Use Less Group

PhD student, Iacopo Russo on what it's like to research within the Use Less Group.

Publications

We present an optimistic, entertaining and richly informed evaluation of the sustainable management of our growing demand for materials, Sustainable Materials With Both Eyes Open

We regularly publish reports and papers, and have a wide selection of videos.

The Use Less Group
The Department of Engineering
The University of Cambridge
Trumpington Street, Cambridge, CB2 1P

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