GREENSBORO, N.C. | Democratic presidential candidate John Edwards said Tuesday his campaign would seek to eliminate its contribution to global warming by becoming "carbon neutral." Speaking to a crowd of college students at Bennett College, the former North Carolina senator urged all Americans to help reduce the emissions of carbon dioxide and other greenhouse gases. "It's time for the president of the United States to ask Americans to be patriotic about something other than war," Edwards said. "This is an emergency. This requires action now." Edwards said his campaign will consult with experts to calculate its total carbon emissions -...