Mary Nichols, chairwoman of the California Air Resources Board, left, and Deb Markowitz, secretary of  the Vermont Agency of  Natural Resources view an
Mary Nichols, chairwoman of the California Air Resources Board, left, and Deb Markowitz, secretary of the Vermont Agency of Natural Resources view an electric car displayed in Sacramento, Calif., following a news conference to announce the signing of an agreement on zero emissions cars, Thursday, Oct. 24, 2013. (Rich Pedroncelli/AP Photo)