Other nominees for Time's person of the year included President Trump and US House Speaker Nancy Pelosi
Greta plans to attend the COP 25 climate summit in Madrid, which starts in just under three weeks
Trump stirred up fresh outrage on social media on Monday with a tweet that sneered at an impassioned speech by Greta
The moment teenage activist Thunberg saw US president at the UN's climate summit, she was visibly not happy