This was the year teens around the world collectively freaked out about climate change, skipped school in the millions, and threw down a heavy guilt trip on all the older leaders standing in the way of progress. "How dare you?" growled 16-year-old Greta Thunberg to Presidents and CEOs at the Climate Action Summit in New York. They have good reason to be pissed off and mobilized: Global emissions continue to get higher and higher, and the effects of climate change are glaringly obvious, with fires, floods, and hurricanes all becoming more common and severe. Especially for young people, global warming now feels like an apocalyptic threat, in the face of which something like going to school seems pointless. Despite all the terrible news these days, however, climate veterans like Adrar feel a cautious sense of hope. "Today we're much closer to systems change than we were in 2010," she said. "The next couple years are really going to be indicators of how much power we've been able to build in this decade."