Are environmentalists “mad as hell” now and willing to become more vocal and politically active? Could be.

They’ve watched greenhouse gas legislation stalling in Congress this year, again. They’ve listened to politicians call global warming the greatest hoax ever foisted on the American public. They’ve seen environmental groups, over the decades, try to be more accommodating with lobbyists and industry, hoping to “get along” if they “give a little.” How much did it get them?

But I detect a recent change of mood. Bill McKibben, one of the country’s leading climate spokesman, said that he wants President Obama to put those solar panels that Ronald Reagan removed from the roof of the White House, back on the roof. And he’s going to take them to DC in October to deliver them, or some of them, to 1600 Pennsylvania Ave. He sounded very determined to push for change, especially at the ballot boxes this November.

Michael Brune, Exec. Director of the Sierra Club, also sounds upset and ready to become more active, especially about the failure this year of green gas legislation in Congress: “Millions of people have written e-mails, called their senators, demonstrated in the streets, taken actions in a variety of different ways, and still we can’t even get 50 votes, much less 60” in the Senate.

I’ve invited both of them to Science Friday to vent. To tell us what they really think about the direction the U.S. is headed compared to the rest of the world and what they, as major spokesmen, believe where the green movement has gone wrong.

What do YOU think, too?