Baltimore Sun: Snow fell on a global warming protest outside the State House yesterday, but it did not dampen the shouts of about 400 activists who urged lawmakers to pass the nation’s toughest law to control greenhouse gases. As supporters waved signs, chanted and banged drums, 18 legislators walked down a symbolic green carpet to sign up as co-sponsors of a bill that would require all businesses and institutions in Maryland to cut emissions of global warming pollution by 90 percent by …