People should consider eating less meat as a way of combating global warming, says the UN's top climate scientist.

Rajendra Pachauri, who chairs the Intergovernmental Panel on Climate Change (IPCC), will make the call at a speech in London on Monday evening.

UN figures suggest that meat production puts more greenhouse gases into the atmosphere than transport.

But a spokeswoman for the UK's National Farmers' Union (NFU) said methane emissions from farms were declining.