A massive US rally against global warming has been organized by the Sierra Club. (file photo)
Tens of thousands of Americans have gathered to urge President Barack Obama to take concrete measures to fight global warming.
The Sunday rally in Washington was organized by local and national environmental groups, including the nations’ most influential, the Sierra Club.
Organizers said the event was the largest climate rally in US history with its estimated 30,000 protesters, who marched towards the White House.
"We want to challenge president Obama to be a main actor as opposed to being a puppet of the big oil companies," said activist Evangeline Lilly.
Protesters demanded Obama to reject the Keystone XL pipeline project, which would transport tar sands oil from Canada to Texas and ordered Environmental Protection Agency (EPA) to set carbon standards for power plants.
The demonstration comes after the country endured record high temperatures, lengthy droughts and superstorm Sandy in 2012.
During the president’s inauguration speech on January 21 and in his State of the Union speech on Tuesday, he vowed to take action against climate change, if Congress fails to do so.
After China, the US is the world’s second largest carbon dioxide emitter and has yet not been able to agree on measures to reduce CO2 emissions, which were presented by Obama in 2009.