Every year, the MIT Technology Review newsroom produces a list of some of the most promising climate tech firms on the planet. Check out the third annual edition of the list, and learn more about why we selected these companies. Our best weapon against climate change is ingenuity—Bill Gates is a technologist, business leader, and philanthropist. It’s a foregone conclusion that the world will not meet the goals for limiting emissions and global warming laid out in the 2015 Paris Agreement. In fact, we’ve already created many tools that are reducing emissions.