Cow flatulence, believe it or not, is a significant contributor to climate change (thank the over-consumption of meat and factory farming).
In light of this, the EPA is considering a tax on livestock gaseous emissions. This initiative to tax cow farts, however, is not without heavy opposition. The counter-claim holds that New York farmers are too fiscally burdened as it is to pay for bovine gas.
I say, if you're going kill the cow, you have to pay for its cheese.