This article is from The Spark, MIT Technology Reviews weekly climate newsletter. To receive it in your inbox every Wednesday, sign up here.The vibes in the climate world this year have largely been less than great.Global greenhouse-gas emissions hit a new high, reaching 37.4 billion metric tons in 2024. This year is also on track to be the warmest on record, with temperatures through September hitting 1.54 C (2.77 F) above preindustrial levels. Global climate talks fell flat, and disasters from wildfires to hurricanes are being made worse by climate change.But among all that (very real) negative news, there was some good, too: We saw progress cutting back on the most polluting fossil fuels, cheaper and better technologies for combating climate change, and a continuous global effort to address the problem. As we near the end of 2024, lets take a moment to look back on some of the bright spots.Were kicking coal to the curbOne of my favorite climate moments from this year happened in the UK. The country has historically relied heavily on coal as an electricity sourceas of 1990, coal met about 65% of its electricity demand. But on September 30, 2024, the last coal plant in the nation shut down.Renewables are stepping in to fill the gap. Wind farms in the UK are on track to produce more electricity this year than coal and gas plants together.The moment was a symbolic one, and it also reflects the very real progress thats happening around the world in inching away from this polluting fossil fuel. In the US, coal made up around 50% of the electricity supply four decades ago. In 2023, that share was roughly 16%.We should see coal use plateau and potentially begin to fall by the end of the decade, according to the International Energy Agency. Progress needs to happen faster, though, and it needs to happen in countries like China, where energy demand is increasing. Theres also growing concern about what increasing energy demand from data centers, including those used to power AI, will mean for efforts to shut off old coal plants.Batteries just keep getting cheaperLithium-ion battery packs are cheaper than ever in 2024, with prices dropping 20% this year to $115 per kilowatt-hour, according to data from BloombergNEF. Thats the biggest drop since 2017.Batteries are a central technology for addressing climate change. They power the electric vehicles were relying on to help clean up the transportation sector and play an increasingly important role for the grid, since they can store energy from inconsistently available renewables like wind and solar.Since EVs are still more expensive upfront than their gas-powered counterparts in most of the world, cheaper batteries are great news for efforts to get more people to take the leap to electric. And its hard to overstate how quickly battery prices have plummeted. Batteries were twice as expensive in 2017 as they are today. Just 10 years ago, prices were six times what they are in 2024.To be fair, theres been mixed news in the EV world this yeara slowdown in demand growth for EVs is actually one of the factors helping battery prices hit record lows. EV sales are still growing around the world, but at a slower pace than they were in 2023. China is the biggest EV market in the world by far, making up three-quarters of global registrations in 2024 as of October.Climate tech is still busy and bustlingLooking back at the energy and climate stories we published this year, I cant help but feel at least a little bit optimistic about whats coming next.Some groups are looking to the natural world to address the climate crisis; this year, I covered a company working to grow microbes in massive bioreactors to help supplement our food sources, as well as researchers who are looking to plants to help mine the metals we need to fight climate change. Others hope to tweak biologymy colleague James Temple spoke with Jennifer Doudna about the potential for CRISPR, the gene-editing technology she pioneered.Companies are deploying air-conditioning systems that can act like batteries, storing up energy for when its needed. The US Department of Energy is investing in projects that aim to concentrate heat from the sun and use it to power the grid or industrial processes. I spoke to a startup looking to make hydropower technology thats safer for fish, and another building magnets using cheap, widely available materials.And in October we published our 2024 list of 15 Climate Tech Companies to Watch, which featured everything from a startup using AI to detect wildfires to a company giving supplements to cattle to help cut emissions from their burps.Climate change represents a massive challenge for the world, and were entering an especially uncertain time. Well be covering it all, the good and the bad. Thanks for being here this year, and Im looking forward to bringing you all the climate tech news you need in 2025.Now read the rest of The SparkRelated readingIf you need a dash of innovation and positivity in your life, might I recommend taking a gander at our list of 15 Climate Tech Companies to Watch?Whats more inspiring than young people working on the worlds most important problems? Our 2024 class of 35 Innovators Under 35 is sure to spread some cheer.If youre needing even more innovation, why not look back at our 10 Breakthrough Technologies? Exascale computers certainly help me put things in perspective. And get excited, because our 2025 list is coming very, very soon.NICO ORTEGAAnother thingThis year was filled with some exciting moments in technology, but there were also some failures. Here are a few of the worst technology flops of 2024. Check it out to see why voluntary carbon markets made the list and learn all about AI slop.And one moreYouve almost certainly heard that energy demand from AI is huge, and only expected to explode in the coming years. A new preprint study aimed to quantify just how bad things are, and the researchers found that data centers accounted for over 4% of electricity consumption in the US between September 2023 and August 2024. And the carbon intensity of the power thats used is nearly 50% higher than the national average.Get all the details in the latest story from my colleague James ODonnell.Keeping up with climateGeothermal energy provides about 1% of global electricity today, but If things go well, the tech could meet up to 15% of global power demand growth through 2050. (Axios)Renting an EV over the holidays? This is a great guide for first-time EV drivers, including helpful tips about how to handle charging. (Bloomberg)Commonwealth Fusion Systems chose Virginia as the site for its first commercial fusion power plant. The company says the 400-megawatt plant will come online in the early 2030s. (Heatmap) I recently visited Commonwealths first demonstration site in Massachusetts. Its basically still a hole in the ground. (MIT Technology Review)The US Department of Energys Loan Programs Office just committed $15 billion to a California utility. Its the largest-ever commitment from the office. (New York Times)The US EPA will grant California the right to ban gas-powered cars by 2035. The agency has to give the state a waiver to set its own rules. (Washington Post) We can expect a legal battle, though. The incoming Trump administration is recommending major changes to cut off support for EVs and charging. (Reuters)China dominates the world of lithium-ion batteries. Some startups in the US and Europe argue that rather than playing catch-up, the rest of the world should focus on alternative chemistries like lithium-sulfur and sodium-ion batteries. (Canary Media)