Thousands of activists block London roads to demand action on climate change

Extinction Rebellion, which generated headlines with a semi-nude protest in the House of Commons earlier this month, has warned its members that some of them could be arrested for taking part in non-violent civil disobedience.

The group is demanding the government declare a climate and ecological emergency, reduce greenhouse gas emissions to net zero by 2025 and create a citizen's assembly of members of the public to lead on decisions to address climate change.