John,
Maybe someone should invent bags that are stuck to the cows a**e to collect all the given off methane, then it could be sold to the polititians to use, as a direct replacement for all the hot air that comes out of them.
The problem is, at normal temperatures, methane is heavier than air, but at raised temperatures it then becomes lighter.
So whoever does the 'milking' should keep an eye on the temp gauge, otherwise the profits just might float away.
Bogs