President Barack Obama kicked off a campaign to promote new restrictions on U.S. power plant emissions on Saturday by tying the fight against climate change with efforts to promote better health for children and the elderly. In his weekly radio address, Obama said the United States had to do more to reduce carbon emissions so that children suffering from asthma and other related ailments did not face further problems as a result of polluted air. Obama said the new guidelines would reduce smog and soot that threaten vulnerable populations such as the young and the aged and he said up...