Methane has 23 times the global warming impact of CO2 and ruminant mammals (cows and sheep) are responsible for 37% of the total methane generated by human activity.

There are approximately 1.5 billion cattle and 1.7 billion sheep on the planet. A single cow can produce as much as 500 litres of methane per day.

Nitrous oxide is almost 300 times as damaging to the climate as carbon dioxide with 65% of the total quantity produced by human activity coming from livestock (mostly their manure).

The animals we rear for meat also account for 64% of all the ammonia we humans impose on our precious atmosphere, contributing significantly to acid rain