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Arizona has repealed a lower vehicle emissions program that was patterned after California's rules after just one year in effect. The state government voted to instead match federal greenhouse-gas regulations.

The United States and China are the world's top two energy consumers, energy producers and greenhouse gas emitters. Though it's unlikely that either nation will brag about holding those top honors, maybe the creation of the U.S.-China Clean Energy Research Center (CERC) will help both clean up their acts.

Many of our readers have vowed not to buy another car until they can get one that features a plug. However, many others can't wait until affordable electric vehicles become widely available. For those that need an affordable car that emits as little as possible and consumes not much more, there are options. The folks at NADAguides.com have compiled a list of the top five cleanest conventional cars currently available. Technically, the list actually contains only four unique cars, since the Chevy