"Event billed as largest climate protest in US history intended as show of force as Obama nears decision on controversial project."
"Thousands of protesters descended on Washington DC on Sunday demanding Barack Obama shut down the Keystone XL pipeline project to show he is serious about taking action on climate change.
Organisers said a crowd of 35,000, carrying placards in the shape of bright red stop signs, gathered at the Washington monument on a bright but bitterly cold day for the march on the White House.
The event, billed as the largest climate protest in US history, was intended as a show of force before Obama renders his decision on the pipeline project in the next few months.
Protesters were bussed in from 30 states and Canadian provinces. Marchers held aloft banners proclaiming "Don't be fossil fools" and "It's time to cut carbon" during the rally."