Brian Czech, 02/20/13

President, Center for the Advancement of the Steady State Economy

In the real world, economic growth means more economic activity, more population × consumption, more GDP. It means more greenhouse gas emissions, less biodiversity, and a growing ecological footprint.

Mike Sweeney, 02/20/13

Executive Director, The Nature Conservancy of California

There's an incredible diversity of nature in California, and we now have more national parks than any other state to prove it. There is really no better place to experience all the central coast has to offer than at Pinnacles National Park.

Seth Baum, 02/20/13

Executive Director, Global Catastrophic Risk Institute

It could be difficult for human civilization to survive a global catastrophe like rapid climate change, nuclear war, or a pandemic disease outbreak. But imagine if two catastrophes strike at the same time.

Peter H. Gleick, 02/20/13

President, Pacific Institute

It turns out there are real jobs to be had in the water sector if we make the investments that are needed in water supply, deliver, treatment, and smart management. Millions of jobs.

Dean Kuipers and David Levine, 02/20/13

If your Manhattan bedroom is under 6 feet of water (and can be again), or millions of cows can't find one green blade of grass because of drought, or all the polar bears die because we lose the Arctic sea ice, do we really care if the solution creates jobs?

Bill Radvak, 02/20/13

President and CEO, American Vanadium Corp

As always, it is a buyer-beware world, where extensive scrutiny must be made regarding the management, values and actions of a company before making an investment. For those who make wise selections for their alternative energy portfolio, great riches may be had.

The University of Central Florida Forum, 02/20/13

Opinion series by faculty, staff and students of UCF

Oysters also filter water -- a lot of water. Scientists estimate that each oyster filters 50 gallons of water each day. That equates to about a bathtub's worth of water filtered by each oyster each day!

Anjali Sareen, 02/20/13

News Editor, The Huffington Post

It's worth noting that many people would shudder at the idea of squirting bodily fluid from an animal directly into their mouths, but those same people drink milk freely and happily because it's packaged to look pretty and marketed to us as a health food.

John Fullerton, 02/20/13

Founder and President, Capital Institute

My daughter and I joined an estimated 50,000 demonstrators in Washington D.C. marching against the XL Pipeline that would connect the Canadian Tar Sands to American refineries. After a half century on this planet, I took to the streets. Here's why.

Dr. James Hansen, 02/19/13

Climatologist

The climate science is crystal clear. We cannot go down the path of the dirty fuels without guaranteeing that the climate system passes tipping points, leaving our children and grandchildren a situation out of their control, a situation of our making.

Helen Grieco, 02/20/13

Organizer, California Common Cause

This month, a U.S. District court ruled that yes, the commercial Drakes Bay Oyster Company squatting in Point Reyes National Seashore after its lease expired had to vacate as long planned.

Peter Fox-Penner, PhD, 02/19/13

Author of Smart Power. Principal and Chairman of The Brattle Group.

The President's speech last week contained more discussion of climate and energy than any State of the Union speech in recent memory -- perhaps ever. Congressional action is still needed right away to reduce uncertainty and improve our chances of meeting climate targets.

Carol Pierson Holding, 02/20/13

Writer, CSRHub

Proponents of Ecopsychology and other conservationists argue that only when we feel the exhilaration of our true place in the universe can we be healthy in not only body but mind and spirit too. It's an agenda as overwhelming as reversing climate change. Shouldn't they go hand in hand?

Hazel Wong and Brigitte Griswold, 02/19/13

Much attention has been paid to the shift in racial and generational demographics this past electoral season and what it means for our political future -- but little coverage was given to what it means for our planet's future.

Michael Marx, 02/20/13

Director, Beyond Oil Campaign, Sierra Club

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.

Stan Sorscher, 02/19/13

Labor Representative, Society for Professional Engineering Employees in Aerospace

Imagine a thought experiment, where we put environmentalists in each country in charge of negotiating the next trade agreement. Preposterous! I know. Stick with me.

Tom Weis, 02/20/13

President, Climate Crisis Solutions

Ending TransCanada's assault on Texas and Oklahoma is the first and easiest thing the president can do to show America he is serious about addressing a climate crisis spiraling out of control on his watch.