What unites us is our commitment to protecting our environment and public health. Now, we are bringing our commitment to clean energy and combating climate change to the U.S. Senate. The environment shouldn't be a partisan or regional issue, it should be a national priority.

Two Sundays ago, I traveled to the nation's capital to attend what was billed as "the largest climate rally in history" and I haven't been able to get the experience -- or a question that haunted me -- out of my mind. Where was everybody?

When people are forced to follow the rules, a lot of them refuse to budge or push back. However, if the issue can be reframed, shall we say, the regulations could be a lot more effective.

To do good work, to be necessary, to have something to give: these are the true gifts. And at least there's still a struggle ahead of us, not just doom and despair. As you gear up for 2013, don't forget that 2012 has been an extraordinary year.

By delegitimizing government and its capacities, conservatives have made it impossible to conduct a serious analysis of the role of government in developing renewables and the conditions under which private sector participation might make sense.

We simply can't let Mitt Romney buy the keys to the White House and let the special interests write our nation's energy plan behind closed doors. He'd roll back every step of progress we've made -- not just in the last four years, but the last 40 years.

We had bipartisan support for environmental stewardship and a dozen nonprofits were created around that time pursuing green goals. What happened then?

Described in 1970 by Time magazine as the "Paul Revere of ecology," Barry Commoner followed Rachel Carson as America's most prominent modern environmentalist.

The following is an excerpt of an article published by Grist. Recently the New York Times published my op-ed “How Liberals Win,” in which...

Work, create, save, tax, invest and sustain. There is no free lunch and you get what you pay for. That is Mike Bloomberg's sustainability state of mind.

Send all your eco-inquiries to Jennifer Grayson at eco.etiquette@gmail.com. Questions may be edited for length and clarity. Hope you don't take offen...

In 1986, Robert Swan made the longest unassisted walk ever to the South Pole. Three years later he went onto the North Pole and by the age of 33, he became first person in history to walk to both North and South Pole.

The way to build a broad movement around environment and climate solutions is to mobilize diverse communities of people around issues that are much closer to their self-interest.

But the fact that fracking isn't safe may not be enough to stop it. After all, President Obama himself delivered a veritable infomercial for fracking during his State of the Union address, pushing it as a source of cheap, reliable energy.

On the big issues, we scored three out of four with Obama this year -- not a bad record for a movement that supposedly was being ignored or taken for granted by the president.