Here's a swell idea. Tax dairy farmers for the methane produced by flatulent cows. Now it is true that cows produce more greenhouse gas than any other source, including vehicle emissions. Yes, livestock are major resource consumers and yes, overgrazing, deforestation and a host of other ills can be pinned on unsustainable farming practices. But taxing the farmer for cow farts is a bit like punishing the prostitute and not the Johns. Estonians must not like milk. The Kiwis made a stink about a similar measure in 2003.