Many people who care about climate change are wrestling with what, if anything, they can do about it. Although many of the most popular consumer choices, from ditching plastic straws to using an electric vehicle instead of a gas-guzzler, have some environmental benefits — they don’t put a dent in global emissions. Meanwhile, carbon pollution is approaching frightening levels: According to an influential report published in October, the world could experience dangerous warming as early as 2030 if we don’t rapidly cut emissions.

And yet, President Trump has reversed course on a lot of US climate policies. His administration has repealed the Clean Power Plan designed to curb pollution from coal plants, gutted stricter climate standards for cars and trucks and, just this month, signed executive orders aimed to streamline the development of new fossil fuel projects. Trump also pledged to withdraw the US from the Paris climate agreement, slowing momentum for global action.