As heatwaves intensify across the globe, the demand for air conditioning and refrigeration skyrockets. The ballooning demand for cooling strains energy infrastructure and escalates emissions from vapor compression systems. These conventional refrigerators and AC units rely on greenhouse gases and inefficient mechanical compressors that have reached their efficiency limits. With little room for improvement, vapor compression technology cannot sustainably shoulder doubling cooling demands. Scientists urgently search for climate-friendly innovations before the warming world overheats.
In a breakthrough discovery, researchers at the Luxembourg Institute of Science and Technology (LIST) pioneer a radically different cooling approach harnessing the electrocaloric cooling effect. This phenomenon describes particular ceramic materials that heat up or cool down when electric fields flip on and off. By cleverly leveraging this conductivity toggle, the LIST team designed an assembly that can pump heat without noisy, energy-draining compressors.
Electrocaloric cooling is a fascinating phenomenon where certain materials experience a reversible temperature change when an electric field is applied. In simpler terms, you can directly use electricity to manipulate their temperature, creating a cooling effect. This opens up exciting possibilities for energy-efficient and environmentally friendly cooling technologies.
The regenerative system developed by LIST alternates layers of electrocaloric capacitors with liquid coolant. Switching an electric field pulls heat from the fluid into the capacitors, cooling the system. Cutting voltage then dissipates the heat, so the cycle repeats. The smooth back-and-forth between hot and cold replaces high-maintenance mechanical parts with solid-state reliability. Scientists calculate that electrocaloric cooling efficiency leapfrogs vapor compression refrigeration by directly shuffling heat instead of wasting effort compressing refrigerants.
Since fluids naturally stratify by temperature, no added energy input is required to cycle hot and cold. The passive electrocaloric cooling generator minimizes electricity demands by exploiting thermodynamics rather than fighting against them. With game-changing energy savings over traditional refrigerator designs, this electrocaloric cooling technology paves the way for truly sustainable cooling.
Seeking real-world integration, LIST researchers collaborate with manufacturing partners to develop prototypes. The original discovery featured a single electrocaloric part, which limited heat transfer speed. The current regenerator assembly overcame this by interleaving many capacitors with parallel coolant channels. This boosts heat pumping capacity for powerful, real-world performance. Ongoing enhancements also aim to lower costs and extend operating lifetimes to enable widespread commercialization.
While the immediate goal focuses on eco-friendly refrigeration, the applications likely won’t stop there. Any process generating unwanted heat could benefit from electrocaloric cooling technology. Air conditioners, electronics cooling, industrial processes and even solar energy storage represent prospective opportunities. Because electrocaloric cooling systems thrive when miniaturized, microchip-level cooling also offers possibilities for computing breakthroughs.
For example, electrocaloric cooling films could provide on-chip cooling for high-performance computer processors, enabling faster computing speeds. Electrocaloric cooling systems can also be used to condense water vapor in air conditioning and dehumidification applications. This could allow environmentally-friendly refrigerants like water instead of HFCs to be used in vapor compression HVAC.
Additionally, the flexibility of electric-powered cooling lends well to renewable energy integration and smart grid load balancing. Electrocaloric heat pumps powered by wind or solar electricity during times of excess generation could store thermal energy for later dispatch while synchronizing supply and demand on the grid. With materials and system configuration innovations, electrocaloric cooling technologies show promise for revolutionizing thermal management across many sectors.
Despite enormous promise, unanswered questions remain regarding large-scale manufacturing and durability. However, early indications suggest the regenerator’s simple solid-state design will prove reliable over long stretches. By dodging complex mechanical components, the approach naturally steers towards sustainability. Cooling demand will only climb higher as climate change continues, but creative solutions like the LIST electrocaloric cooling regenerator offer hope we can innovate our way to a cooler future.
Intel’s new manufacturing plant in Leixlip, Ireland, which cost $18.5 billion to build, is replete with technologies touted for conserving energy and water including programmable, all-LED lighting and a water reclamation and filtration system that could save 275 million gallons a year.
One of its more unusual features, however, is an approach that’s often overlooked: capturing heat generated by equipment in the facility and funneling it into production processes rather than expelling it through cooling towers. This was accomplished by the installation of recovery chillers that capture heat created by Intel’s high-temperature manufacturing processes and pipe it in the form of heated water to other places at the facility.
Intel estimates these heat recovery measures will allow it to significantly cut the natural gas it must buy to run operations at the site, Fab 34. It will use nine times as much recovered energy than what is generated by other fuels, the company projects. That so-called “waste heat” can be used for tasks such as preheating the ultra-pure water Intel needs for semiconductor fabrication or keeping buildings at the site warm during cooler weather, said Rich Riley, principal engineer in Intel’s corporate services development group.
“If we didn’t have that heat, we would need that much more gas to facilitate the [heating, ventilation and air-conditioning] operations,” Riley said. “This is an overall reduction of natural gas consumption.”
Over time, Intel’s plan is to build on heat recovery and other energy efficiency measures by updating them with industrial equipment, such as heat pumps, that run on electricity.
Intel’s near-term energy-related sustainability goals include reducing Scope 1 and 2 emissions by 10 percent by 2030 from a 2019 baseline (it has achieved 4 percent as of fiscal year 2022); and conserving up to 4 billion kilowatt-hours cumulatively.
An untapped source of energy efficiency
Intel hasn’t disclosed the potential impact on its carbon emissions this heat recovery at Fab 34 effort could have, but a retrofit using water-to-water heat pumps in Fab 10 (also in Leixlip) will save an estimated 18.3 million kilowatt-hours of electricity annually. It will reduce Scope 1 emissions by about 4,760 metric tons, but Scope 2 emissions will increase by about 1,627 metric tons because of the electricity needed for the heat pumps.
Industrial energy remains a thorny challenge for corporate sustainability teams: An estimated 20 percent to 25 percent of energy consumed globally by industrial sources is still predominantly powered by coal and natural gas, according to the International Energy Agency.
The potential energy cost savings of using recovered waste heat for industrial processes, district heating applications or to generate electricity could reach up to $152.5 billion annually, slightly less than half the value of the natural gas imported by the European Union in 2022, according to a McKinsey report published in November. The analysis estimates the global recoverable heat potential is at least 3,100 terawatt-hours.
“In our view, if you want to decarbonize, heat recovery and waste heat is one of the most economical levers available,” said Ken Somers, a McKinsey partner who was one of the report’s authors. One barrier to adoption has been low natural gas prices, but tariffs and supply shortages have prompted companies to rethink their dependence, he said.
The industrial heat pump technology needed to move heat from where it’s generated to where it’s needed in a production process is also maturing. The potential for manufacturers of chemicals, consumer products, food and pharmaceuticals to use this approach is growing as a precursor to the electrification of production systems, said Patricia Provot, president of thermal production equipment manufacturer Armstrong International.
“If your plan is to fully decarbonize, your first step is to get rid of steam and use hot water, and then try to recover as much of that waste heat as possible and put it back into the system,” Provot said.
Cost-cutting green home technologies are set to launch in the UK this summer to make it easier and cheaper for homeowners to slash their energy use and carbon footprint.
Demand for green home technologies is surging as households look to invest in new equipment to cut their energy bills and reduce reliance on grid power.
And that has enticed overseas firms to enter the UK market with new products such as high temperature heat pumps and technology that can automatically design solar energy installations online.
Norwegian solar marketplace Otovo plans to launch a UK branch this summer, promising customers savings of up to 10 per cent on the cost of rooftop solar installation.
The online marketplace takes a customer’s address and then automatically calculates the size, shape and specification of suitable rooftop solar products. It then runs an automated, ‘real time’ auction between local solar installers to find the cheapest price for the work.
Co-founder Andreas Thorsheim said customers save time and money by having the survey work and quote calculated remotely. Installers also benefit by not having to “drive around drinking tea with people who end up not buying,” he added.
“In essence we are doing the Googling for you, we’re doing the price comparison for you, we’re doing the quality assurance of these workmen for you, and presenting you with the cheapest available price,” he told i.
Otovo was founded in Oslo, Norway in 2016 and now operates across seven European countries. A UK outpost will open in July or August this year, Mr Thorsheim said.
Demand for solar has rocketed in recent months as consumers across the UK and Europe hunt for ways to reduce their reliance on expensive grid electricity. Calculations suggest rooftop solar can shave hundreds of pounds off the average annual electricity bill.
Meanwhile high temperature heat pumps, which pump very hot water around the house in the same way as a gas boiler does, are set to arrive in the UK this month.
Usually air source pumps heat water up to a maximum of 50C. Homes therefore usually need to be well insulated with large radiators or underfloor heating to stay warm.
But high temperature pumps heat water to between 65C and 90C – similar to temperatures achieved using a gas boiler. The idea is that these pumps will act as green replacements for gas boilers in leaky homes that are too draughty for a standard lower temperature heat pump.
Viessmann Vitocal 151-A air source heat pump indoor and outdoor units (Photo: Viessmann)
This month, heat pump manufacture Viessmann will start selling two high temperature heat pumps in the UK. Both heat radiator water to up to 70C. This means that in most cases they can use existing radiators and do not require under-floor heating, Viessmann said, saving households thousands of pounds in avoided retrofit work.
Meanwhile, rival heat pump manufacturer Vattenfall is also developing a high temperature heat pump, using technology adapted from Japanese hot water systems.
“If you are in two identical houses, and in one is a traditional gas boiler and in the other is our high temperature heat pump, you won’t feel the difference,” said Wouter Wolfswinkel, who is leading the heat pump’s development at Vattenfall.
After successful trials in the Netherlands and Germany, Vattenfall plans to start selling this heat pump in the Netherlands starting this month, and i understands the team is keen to bring it to the UK as soon as possible.
Installation costs are around €14,000 (£11,700), Mr Wolfswinkel told i. This is more expensive than a gas boiler and a traditional heat pump but the new system cuts out the need for expensive insulation work on older properties, he stressed.
The climate emergency is the biggest threat to civilisation we have ever faced. But there is good news: we already have every tool we need to beat it. The challenge is not identifying the solutions, but rolling them out with great speed.
Some key sectors are already racing ahead, such as electric cars. They are already cheaper to own and run in many places – and when the purchase prices equal those of fossil-fueled vehicles in the next few years, a runaway tipping point will be reached.
Electricity from renewables is now the cheapest form of power in most places, sometimes even cheaper than continuing to run existing coal plants. There’s a long way to go to meet the world’s huge energy demand, but the plummeting costs of batteries and other storage technologies bodes well.
And many big companies are realising that a failure to invest will be far more expensive as the impacts of global heating destroy economies. Even some of the biggest polluters, such as cement and steel, have seen the green writing on the wall.
Buildings are big emitters but the solution – improved energy efficiency – is simple to achieve and saves the occupants money, particularly with the cost of installing technology such as heat pumps expected to fall.
Stopping the razing of forests requires no technology at all, but it does require government action. While progress is poor – and Bolsonaro’s Brazil is going backwards – countries such as Indonesia have shown regulatory action can be effective. Protecting and restoring forests, particularly by empowering indigenous people, is a potent tool.
Recognition of the role food and farming play in driving global heating is high, and the solutions, from alternatives to meat to regenerative farming, are starting to grow. As with fossil fuels, ending vast and harmful subsidies is key, and there are glimmers of hope here, too.
In the climate crisis, every fraction of a degree matters and so every action reduces people’s suffering. Every action makes the world a cleaner and better place to live – by, for example, cutting the air pollution that ends millions of lives a year.
The real fuel for the green transition is a combination of those most valuable and intangible of commodities: political will and skill. The supply is being increased by demands for action from youth strikers to chief executives, and must be used to face down powerful vested interests, such as the fossil fuel, aviation and cattle industries. The race for a sustainable, low-carbon future is on, and the upcoming Cop26 climate talks in Glasgow will show how much faster we need to go.
Transport
Responsible for 14-28% of global greenhouse gas emissions, transport has been slow to decarbonise, and faces particular challenges in areas such as long-haul flight.
But technical solutions are available, if the will, public policy and spending are there, too. Electric cars are the most obvious: petrol and diesel vehicles will barely be produced in Europe within the decade. EV sales are accelerating everywhere, with the likes of Norway well past the tipping point, and cheaper electric vehicles coming from China have cut the fumes from buses. Meanwhile, combustion engines are ever more efficient and less polluting.
Employees on the assembly line for electric buses in Xi an, Shaanxi province, China. Photograph: Visual China Group/Getty Images
Bike and scooter schemes are growing rapidly as cities around the world embrace electric micromobility. Far cleaner ships for global freight are coming. The potential of hydrogen is growing, for cleaner trains where electrification is impractical, to be followed by ships and even, one day, planes. Manufacturers expect short-haul electric aircraft much sooner. Most of all, the pandemic has shown that a world without hypermobility is possible – and that many people will accept, or even embrace, a life where they commute and travel less. Gwyn Topham
Deforestation
Deforestation and land use change are the second-largest source of human-caused greenhouse gas emissions. The destruction of the world’s forests has continued at a relentless pace during the pandemic, with millions of hectares lost, driven by land-clearing in the Brazilian Amazon.
Volunteers plant mangrove tree seedlings in a conservation area on Dupa beach, Indonesia. Photograph: Basri Marzuki/NurPhoto/REX/Shutterstock
But there are reasons for hope. The UK has put nature at the heart of its Cop26 presidency and behind the scenes, the government is pushing hard for finance and new commitments from forested nations to protect the world’s remaining carbon banks. Indonesia and Malaysia, once global hotspots of deforestation, have experienced significant falls in recent years, the result of increased restrictions on palm oil plantations. However, the 2000s soy moratorium in Brazil shows these trends are reversible. Finally, there is a growing recognition of the importance of indigenous communities to protecting the world’s forests and biodiversity. In the face of racism and targeted violence, a growing number of studies and reports show they are the best guardians of the forest. Empowering those communities will be vital to ending deforestation. Patrick Greenfield
Technology
Emissions from technology companies, including direct emissions, emissions from electricity use and other operations such as manufacturing, account for 0.3% of global carbon emissions, while emissions from cryptocurrencies is a huge emerging issue.
Mining – the process in which a bitcoin is awarded to a computer that solves a complex series of algorithms – is a deeply energy-intensive process and only gets more energy-intensive as the algorithms grow more complex. But new mining methods are lighter, environmentally. A system called “proof of stake” has a 99% lower carbon footprint.
Researchers pose for a group photo at the International Research Center of Big Data for Sustainable Development Goals in Beijing, China. The centre was inaugurated to support the UN 2030 Agenda for Sustainable Development. Photograph: Xinhua/REX/Shutterstock
Scrutiny of the whole sector is increasing, spearheaded by tech workers who walked out in their hundreds to join climate change marches in 2019. The companies have pledged to do better: Amazon aims to be net zero carbon by 2040 and powered with 100% renewable energy by 2025. Facebook has a target of net zero emissions for its entire supply chain by 2030 and Microsoft has pledged to become carbon negative by 2030. Apple has committed to become carbon-neutral across its whole supply chain by 2030.
They’re still falling short when it comes to delivering, but employee groups continue to push. Kari Paul
Business
For decades Exxon Mobil has arguably been corporate America’s biggest climate change denier. But this year, the activist investor Engine No 1 won three seats on the company’s board with an agenda to force the company to finally acknowledge and confront the climate crisis.
Across corporate America and all around the world there are signs of change. The Federal Reserve, the world’s most powerful central bank, is beefing up its climate team. BlackRock, the world’s biggest investor, has made environmental sustainability a core goal for the company.
This isn’t about ideology: it’s about “common sense.” According to BlackRock, failure to tackle climate change is simply bad for business. The investor calculates that 58% of the US will suffer economic decline by 2060-2080 if nothing is done.
Much more needs to be done, and some question whether corporate America can really solve this crisis without government action. But the days of denial are over – what matters now is action. Dom Rushe
Electricity
The rocketing global market price for gas has ripped through world economies, forcing factories to close, triggering blackouts in China, and threatening to cool the global economic recovery from the Covid-19 pandemic.
But it has also spelled out a clear economic case for governments to redouble their efforts in developing homegrown, low-carbon electricity systems.
The good news is that renewable energy is ready to step up and play a greater role in electricity systems across the globe.
A woman completes paperwork by the light of solar-powered lamps in a village shop for solar products. Photograph: Kunal Gupta/Climate Visuals Countdown
The precipitous fall in the price of wind and solar energy has helped to incentivise fresh investments in electricity vehicles and energy storage technologies, such as batteries, where costs are plummeting too. Soon, wind and solar power will help to produce green hydrogen, which can be stored over long periods of time to generate electricity during days that are a little less bright or breezy.
All of these advances are made possible by cheap renewables, and will help countries to use more renewable energy too. There has never been a better time to step back from gas and go green. Jillian Ambrose
Buildings
The built environment is one of our biggest polluters, responsible for about 40% of global carbon emissions.
Over the past two decades, the carbon footprint of buildings “in use” has been greatly reduced by energy-saving technologies – better insulation, triple-glazing, and on-site renewables such as solar panels and ground-source heat pumps. Onheat pumps, the UK lags far behind: Norway, through a mixture of grants and high electricity prices, has installed more than 600 heat pumps for every 1,000 households.
As national energy grids are decarbonising, the focus is shifting to reducing the “embodied energy” of materials – which can account for up to three-quarters of a building’s emissions over its lifespan – for example by reducing the amount of concrete and steel in favour of timber.
The Vertical Forest in the Porta Nuova district in Milan. Photograph: Miguel Medina/AFP/Getty
There is also a growing movement to prioritise refurbishment and reuse over demolition, driven by the realisation that the most sustainable buildings are the ones that already exist. Oliver Wainwright
Food and farming
The hoofprint of the global livestock industry is a significant one, accounting for about 14% of total annual greenhouse gas emissions. But it is increasingly recognised and accepted by national governments.
New Zealand now has a legal commitment to reduce methane emissions from agriculture by 10% by 2030, while Denmark has passed a legally binding target to reduce climate emissions from the agricultural sector by 55% by 2030.
While global meat production is increasing, there is a growing shift towards fish and poultry, which have a comparatively lower emissions footprint than red meats. The food industry is also developing a range of lower-carbon products using plant-based proteins such as soy and pea, and insect and lab-grown meat alternatives. Tom Levitt
Manufacturing
Decarbonising the manufacturing of every product needed by a modern economy is a vast and varied task. Some sectors are well on their way. For instance, Apple, the world’s third-largest maker of mobile phones by volume, has pledged to produce net zero carbon throughout its supply chain by 2030.
For many others, advances in efficiency of factories and their products will be accelerated by machine learning and other artificial intelligence technologies that are still in their infancy. There are even hopeful signs in some of the hardest sectors to decarbonise, such as plans by Volvo to replace coal with hydrogen in the steel it uses in cars.
One of the greatest reasons for optimism is manufacturers’ increasing awareness of circular design principles. Making products easier to recycle from the start will help to cut emissions from fresh resource extraction– although a bigger question remains as to whether rich societies can reduce consumption, the most obvious way to cut emissions. Jasper Jolly
