InsideClimate: As many as 40,000 protesters from 30 states descended on the White House on Sunday and demanded that President Obama kill the proposed Keystone XL oil sands pipeline. By the estimates of organizers, it was the biggest protest march for climate change action in the nation's history. In about 18 cities from Boston to Los Angeles, thousands more participated in solidarity ralliesand helped garner unusual nationwide media attention for an issue that has typically slipped under the local media radar....