esterday over 35,000 people rallied in Washington D.C. for urgent action on climate change, which, according to organizers, was the largest climate march in U.S. history. Activists called on the Obama Administration to do much more to tackle climate change, including rejecting the Keystone XL Pipeline, which would bring carbon-heavy tar sands oil from Canada through the U.S. to a world market.

“For 25 years our government has basically ignored the climate crisis: now people in large numbers are finally demanding they get to work. We shouldn’t have to be here—science should have decided our course long ago. But it takes a movement to stand up to all that money,” said Bill McKibben, founder of the climate activist group 350.org, at the rally. McKibben called the tar sands in Alberta, Canada, “one of the largest carbon bombs in history.”

There is considerable debate about how much higher carbon emissions are from tar sands oil, but no one doubts that they are larger. Cambridge Energy Research Associates (CERA) estimated the greenhouse gas emissions of the tar sands was 5-15 percent higher than conventional sources, while the International Energy Agency (IEA) found that emissions were 20 percent higher. However, recent research has shown that the destruction of boreal forest and peatlands adds considerable more carbon emissions to the controversial fuel source. In fact, one study estimated that if the entirety of the tar sands were exploited it would raise global temperatures 0.64 degrees Fahrenheit (0.36 degrees Celsius), representing about 45 percent of how much the world has already warmed since the Industrial Revolution.

Read more at http://news.mongabay.com/2013/0218-hance-climate-rally.html#mqykqEigG6jk22qu.99