Greta: It's never too late to do as much as we can

Activist Greta Thunberg is still hopeful the world can achieve "massive changes" to combat climate change.

Climate change activist Greta Thunberg has been highly critical of global leaders over their action to limit global warming.

But speaking to the BBC's Andrew Marr ahead of the COP26 climate summit, she said she was still hopeful - but that "massive changes" were needed.