I guess what we need now is electric cattle?

Which causes more greenhouse gas emissions, rearing cattle or driving cars? Surprise!
"According to a new report published by the United Nations Food and Agriculture Organization, the livestock sector generates more greenhouse gas emissions as measured in CO2 equivalent – 18 percent – than transport. It is also a major source of land and water degradation."

This doesn't mean that you can drive that gas-guzzling SUV more often than you need to.

http://www.fao.org/newsroom/en/news/2006/1000448/index.html