Comment: Why a modern version of the US buffalo massacre is likely

Reducing livestock numbers is of course likely to be much easier politically than, for example, asking the French people to pay more for fuel, writes Stephen Cadogan.

The tens of millions of wild ruminants that roamed the United States until the mid-19th century are estimated to have produced about 86% of the methane emissions which come from the 90-95 million cattle now in the US.