Uh, title does not make much sense? Well it sure does make sense in Sweden where their trains run on cows. Yes, cows!

The rising oil prices have forced people to search for alternative fuel sources and the Swedes have found it in the most unlikely of places… cow guts.

Cows are butchered and their entrails stewed to produce methane which is then used to run ‘biogas’ powered trains, taxis and trucks. Diesel powered vehicles will eventually give way to these cow powered vehicles.

I guess this could be the reason why the Americans are studying the “greenhouse gas” emissions of cows eh?