BBC News - How methane is measured with a 'burp gun'

Scientists in Liverpool have been testing how much methane cows produce when they burp.

It's part of a research project to find out how much methane cattle produce after feeding and whether anything can be done to reduce it.

Richard Westcott spoke to Doctor Rob Smith from the University of Liverpool about the device they use.

Flashback: BBC News - Whitehall farce of culling the cows to prevent global warming

A bid to cull a third of the UK's cows and sheep to fight global warming and reduce methane emissions - was planned as it allegedly could have led to fewer burgers and lamb chops being eaten.

Health Secretary Andy Burnham was said to think was a marvellous idea but BBC Deputy Political Editor James Landale explains how the plan was killed off.