Living on Earth: YOUNG: The Environmental Protection Agency recently announced tough new emissions standards for cars and trucks–the country’s first limits on greenhouse gases from vehicles. And early next year the EPA will ask big industrial polluters to cut back on C02. These moves come thanks to the EPA’s new authority to regulate greenhouse gases. But that upsets some members of Congress who think the agency has no business regulating its way to climate change policy. Living on Earth’s Mitra Taj …