Across the globe, chickens and pigs are doing their bit to curb global warming. But cows and sheep still have some catching up to do.
The farm animals produce lots of methane, a potent greenhouse gas that gets far less public attention that carbon dioxide yet is at heart of efforts to fight climate change...
Government policies and UN-backed system of emission credits is proving a money-spinner for investors, farmers and big polluters such as power stations wanting to offset their own emissions of greenhouse gases, particularly carbon dioxide (CO2).
The reason is simple: methane is 23 times more potent than carbon dioxide in trapping heat in the atmosphere and it is relatively simple to capture the gas from animal waste, landfills, coal mines or leaky natural gas pipes.
A fifth of all greenhouse gas-included global warming has been due to methane since pre-industrial times.
Methane concentrations have increased about 150% in the air since 1750 and now far exceeded the natural range of the past 650,000 years! Human activities are to blame!