As part of our ongoing series of reports on the environment,...

As part of our ongoing series of reports on the environment, 'America Goes Green,' we take on the question that can make otherwise competent adults quake with fear. We've all been there. You come to the end of the checkout line and then comes that question: 'Paper or plastic?' For that one brief moment, we grocery buyers are made to feel like the fate of the planet hinges on our decision.