Scientists are trying to prove that a herd of cows causes more pollution than a car.
So who knows, in a few years time our dear cows may be sporting sexy little machines (similar to catalytic converters) to help save our environment.
Conversation in 2020
Mum: "Look Harry, a cow!"
Little Harry: "cow!"
Mum: "Cows go moo, Harry. Moo moo and brrum brrum!"