Swedish climate activist Greta Thuberg participated on Monday in a demonstration in a park on the outskirts of the climate summit in Glasgow, Scotland, organized by the network Fridays for future.

- The change does not come from within, says Thunberg, and refers to the politicians and world leaders in place inside COP26.

- No more blah, blah, blah!

Speaking at the summit, the Prime Minister of the United Kingdom Boris Johnson retweeted a call to her millions of supporters to sign an open letter addressed to world leaders.

Hear more from Greta Thunberg and the climate activists in the clip above.