She said: ‘Unfortunately, we probably already know the outcome. World leaders are still trying to run away from their responsibilities but we have to make sure they cannot do that.
‘We will make sure that we put them against the wall and they will have to do their job to protect our futures.’
Swedish Greta was cheered by the crowd who chanted her name as she arrived wearing her favourite yellow raincoat and a woolly hat.
She said: ‘It is not fair that the older generation are handing over the responsibility to solve this crisis to us young people who have not started this crisis. It’s not fair that we have to do all this.