On Wednesday, Massey Energy CEO Don Blankenship, the head of the fourth largest coal company in the nation, said in an interview that “I deny that there is any science that supports global warming.”

While it baffles me that flat-Earthers like Blankenship still exist, my response to the...

As President Obama heads to China, it is important to recognize just how much has changed in the past year. For the first time ever, an American president is traveling to Beijing with the issue of climate change at the top of his agenda. This kind of focus would have...

UN Secretary-General Ban Ki-Moon is hopeful that the December climate conference in Copenhagen will be elevated to the head-of-state level, assuring that the session will receive top-order attention from the world's leaders.

He told me that on Tuesday when we met in Washington, where Ban is continuing to lend his eloquent...

Last week, Republican Senator Lindsey Graham said, “The green economy is coming. We can either follow or lead.”

The senator was explaining why he supports the clean energy and climate legislation that is currently before the Senate. His words remind us that this bill isn’t just about...

The Senate has started debating the Clean Energy Jobs and American Power Act, and in just a few weeks, the United Nations climate meetings in Copenhagen will begin.

I have chosen this moment to release my first book, Clean Energy Common Sense.

I hope this book will inspire...

I have been an environmental advocate for more than 35 years. And throughout that time, I have written policy briefs, magazine articles, and blog posts, but never before had I been inspired to write a book.

That changed several months ago. I realized that we had arrived at a...

I love the title of Al Gore new book, Our Choice: A Plan to Solve the Climate Crisis. Not only does it broadcast the fact that global warming can be solved, but it also reminds us that the decision to do so is ours to make.

In my...

Last Friday, Senators Kerry and Boxer released a more detailed draft of the clean energy and climate legislation they introduced last month. This new version brings welcome clarity and offers an excellent starting point for Senate Environment and Public Works Committee to begin their deliberations.

The Draft Gets Key...

Two weeks ago, I gave a speech at MIT urging the students to use their ingenuity and engineering expertise to help stop global warming. It was inspiring to speak directly to young people who have the talent to help put America at the forefront of the global market for...

Just as support for clean energy and climate solutions is growing among Americans from all walks of life -- from Fortune 500 executives to Iraqi war veterans to union members -- we learn new secrets about the old forces eager to keep us hooked on dirty fossil...

I love that Huffington Post is actively encouraging readers to reduce our individual impact on the environment. By taking small steps in our daily lives—like how we get to work or where we buy our food—we can help preserve the natural systems we humans rely on to sustain us.

The game changed on Sunday. The New York Times op-ed written by Republican Senator Lindsey Graham and Democratic Senator John Kerry calling for clean energy and climate legislation transformed the debate from “maybe some time in the next year or two,” to “likely this fall.”

What makes the...

For the second time in three years, the Nobel Peace Prize has highlighted the importance of U.S. leadership in curbing global climate change. The message is unmistakable: our friends and allies around the world are counting on us to lead, while there's still time to act.

In 2007, the prize...

I still remember my first visit to a national park. I was nine years old, and my family traveled to the Grand Tetons in Wyoming. For a child from Northern New Jersey, it was a revelation. I was...

I still remember my first visit to a national park. I was nine years old, and my family traveled to the Grand Tetons in Wyoming. For a child from Northern New Jersey, it was a revelation. I was stunned by the scale of everything: the open sky, the unending...

Our oceans feed the world, provide jobs, and generate most of the planet's oxygen. Oceans cover 71 percent of the earth and contain more than 97 percent of the world's water. Our survival literally depends on their health. And yet few people realize that the oceans are suffering from a...

The G20 Summit has arrived in Pittsburgh on the heels of the Climate Summit in New York. These back-to-back meetings on the world's climate and the world's economy signify that protecting the planet has economic dimensions. So let's ask the question that's on many doubters' minds. Won't new...

On Wednesday, the last "Made in America" rally took place in Pennsylvania. Members of the United Steelworkers and other unions joined forces with environmentalists to show their support for clean energy and climate legislation just before world leaders pull into town for the G20 Summit.

G20...

Climate Week has begun, and as foreign dignitaries descend on the United Nations and the Clinton Global Initiative annual meeting, I think most of the world's nations will be singing a shared refrain: it is time for the United States to take action on global warming.
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This Wednesday, President Obama will meet with Canada's Prime Minister Stephen Harper at the White House to talk about climate change and energy issues. The word "expansion" may not appear on the official, diplomatic schedule, but I am certain it is on Harper's agenda.

What does he want to...