JEREMY CORBYN and John McDonnell joined tens of thousands of people yesterday as they marched through central London calling on governments to act on climate change.

Around 50,000 heard Labour leader Mr Corbyn call on those gathering for UN talks on climate change in Paris to “listen to the words of millions all around the world” who are saying it is possible to reduce emissions and protect the environment and our planet.

Mr Corbyn told crowds that the issues facing the world are “pollution, climate change, inequality, environmental refugees, war refugees and resource wars” and called for these issues to be addressed in Paris.

He said that those engaging in talks had an “enormous opportunity in front of them” but warned that doing nothing and allowing the pollution of the planet to continue would ensure we “bequeath to future generations a world of flooding, a world of environmental disaster, a world where our children will not be able to live or eat properly.

“Our message today is to them: ‘Do what you are sent there to do. Do what you have been sent there to do on our behalf’.”

Environmental campaigners from a broad coalition of groups and political parties were joined by trade unionists and celebrities such as Emma Thompson, Vivienne Westwood and Charlotte Church to call for action on climate change.

Ms Westwood told the rally that “global warming is at a tipping point” and must be stopped now.

She said: “The rotten financial system is the cause of all our problems — poverty, war, climate change,” adding that politicians are trapped in a “rotten financial system” committing “crimes against humanity.”

Green MP Caroline Lucas welcomed the huge turnout in London and other cities across the world, telling crowds: “Together we are more powerful than they can ever imagine.”

Friends of the Earth chief executive Craig Bennett said the global demonstrations were sending a signal that governments could no longer ignore.

“We know the challenge we face, we know the solutions: now is the time to act,” he said.

British PM David Cameron will call for “global action to deal with a global problem” in Paris but is expected to come under pressure for slashing government funding for renewable energy.

World leaders from more than 50 countries will attend the UN talks aimed at securing deals to curb rising temperatures and shift the world to 100 per cent renewable energy.