Instead of speculating how Canada or its tar sands industry might react to a rejection of Keystone XL, the president should ask, "how will the world react?" The whole world, after all, will have to deal with the mess of climate change.

The president left town during a historic rally pressuring him to take action to reject a pipeline, in order to play a game based on egregious wasting of natural resources with someone who does business with Anadarko, an oil/gas/pipeline company.

I concede the point: the Keystone XL is a symbol. But is excoriation of symbols really all that meaningful in the larger context of planetary stewardship?

If oil workers could choose, would they choose to work in toxic environments with damaging chemicals, or would they choose to work surrounded by clean air? If people had a choice, what would that choice be?

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If we can keep rallying the kind of energy (sustainable, renewable passion) around fighting climate change, we will have a shot at success.

Climate change is already threatening our communities with extreme weather and costly damages. Fortunately President Obama has the power to stop a major source of global warming pollution from spreading: tar sands oil.

February 17 was a sunny, clear day in Washington, D.C., although temperatures barely topped the freezing point. Despite the cold weather, an estimated...

President Obama must lead our nation in the transition to a clean-energy economy that will create jobs, clean our air and water, protect our wild places, and improve our health. It's time to move America Forward on Climate.

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Today, over 40,000 people poured into the streets of Washington, DC to protest the Keystone XL pipeline and push President Obama "Forward on Climate."

An estimated 40,000 people gathered in Washington, D.C. on Sunday for the Forward on Climate Rally on the National Mall. The rally preceded a march to...

If you're coming to D.C. this weekend, you won't see your parents' environmental movement here on the Mall. The climate crisis has forged a new, diverse coalition of Americans who have seen the effects of our fossil fuel dependency and want no future with it.

President Obama underscored his commitment to fighting climate change in both his Inaugural Address and his State of the Union Address. Now he has two critical opportunities to turn those words into deeds.

I admit it: For a long time, I didn't get the Keystone XL pipeline. Where is it? What's it for? It's bad -- why? Why are people so fired up about it?

On February 17, tens of thousands are coming together in Washington, D.C. to ask the president to stand up for climate. This is the beginning. The beginning of a real battle, for America's future.