'She seems very happy': Trump appears to mock Greta Thunberg's emotional speech

Teenage climate activists told world leaders 'you are failing us' and accused them of 'betrayal'

Donald Trump appears to have taken a swipe at teenage climate activist Greta Thunberg, tweeting a video of an emotional Thunberg with an apparently sarcastic comment that she seems to be "very happy" and looking forward to a bright future.

"She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!" tweeted the US president late on Monday night.