The man behind one of the most influential reports on climate change, Lord Stern, has highlighted the impact meat production has on greenhouse gas emissions. Part of it comes through methane made by the animals as they digest food. So which farm animals expel the most methane?

A diet that relies heavily on meat production results in higher emissions than a typical vegetarian diet, says Lord Stern.

The author of the 2006 Stern Review into the cost of climate change attacked the “enormous pressure” meat production puts on the world’s resources and said people were becoming increasingly aware about “low carbon consumption”.

Read more (BBC News)