16-year-old activist Greta Thunberg is trying to save the planet from climate change. But it hasn't been easy. Every step of the way, she's received pushback from climate deniers ranging from anonymous Twitter trolls to world leaders. What her vocal critics all seem to have in common is that they don't believe in science and they are full-grown adults who feel threatened by a teenager. Greta doesn't have time to respond to every single one, though she has had time to shut down quite a few of them, including the U.S. President with just a simple copy-and-paste. Fortunately, she has a LOT of people in her corner, many of them popping up to quickly and cleverly defend her from the swarms of haters and losers online.