<p>California may become first state to regulate 'greenhouse gas' from cars.</p>
<p>California would become the first state to regulate "greenhouse gas" emissions from passenger vehicles under legislation narrowly approved by the Assembly and sent to the governor Monday.</p>
<p>AB 1493 was hailed by supporters as a first step toward easing global warming, but critics called it "feel good" legislation that would raise car prices and reduce safety.</p>