Kelly Rigg, 06/28/12

Executive Director, GCCA

Let's face it. The United Nations Conference on Sustainable Development (Rio 20) was a flop -- at least the part that involved negotiations amongst governments.

James Thornton, 06/28/12

CEO, ClientEarth

In the U.K. and the rest of Europe, when it comes to the environment, judges often don't know the law. And they can be wilful in remaining ignorant.

Robert Walker, 06/28/12

President, Population Institute

While Rio 20 did not produce any major environmental breakthroughs, there is hope on another front: population. An international family planning summit will take place in London on July 11, World Population Day.

Laura Klein, 06/27/12

OrganicAuthority.com

We caught up with George on the heels of winning the NRDC's fourth annual Growing Green Award, given for his efforts in making our food system healthier and more sustainable.

Elischia Fludd, 06/28/12

Gender Justice Activist, Humanitarian, Founder of EOTO World.

Indeed, the dialogues were an innovative process to the UN system that leaves many wondering if such a process will become a staple of UN engagement with civil society.

Margaret Hyde, 06/27/12

Filmmaker, Writer and Photographer

If space is an issue or you have older children, a pizza garden is a lot fun and keeps them really engaged. In a small bed or pots, plant a few tomato plants, basil and oregano -- all of the garden ingredients that you need for a pizza.

Bianca Jagger, 06/27/12

Founder and Chair, Bianca Jagger Human Rights Foundation

What Rio+20 has demonstrated is that we can no longer stand by and wait for world leaders to provide solutions to prevent us from reaching the tipping point, or point of no return.

Tamar Haspel, 06/27/12

Ex-urbanite now knee-deep in chicken poop: www.starvingofftheland.com

"I've never been so disgusted with the human race," said one commenter. What could he have been reacting to? A piece on slavery? The Crusades? No, it was a piece about pigs.

Colleen Becker, 06/27/12

American writer based in London

Practicing what she calls "political medicine," Stein encourages her natural allies to heal themselves from a "sadomasochistic relationship to corporate politics" by acknowledging their agency.

L. Steven Sieden, 06/28/12

Author, 'A Fuller View' and 'Buckminster Fuller's Universe'

The Rio 20 conference was a bust because our so-called leaders could not decide on a purpose much less any significant results. This seems like a predictable outcome given Buckminster Fuller's perspective that "all politics are not only obsolete but lethal."

Mark Tercek, 06/28/12

CEO, The Nature Conservancy

Twenty years ago, who would have thought that these would be the players creating a bold new model for sustainability in the 21st century?

Dr. Reese Halter, 06/27/12

Broadcaster, conservation biologist

When humans brutally massacre sharks for their fins (finning them alive and throwing them back into the sea) food webs unravel.

Michael Brune, 06/27/12

Executive Director, The Sierra Club

We don't need tar-sands oil from Canada, yet Big Oil is determined to force us to let them pipe through our nation so they can export it abroad. And now we've got some shocking evidence of just how high a price we could end up paying.

Alex Pasternack, 06/27/12

Editor, Motherboard.tv

Public parks don't tend to be cash cows, but the park that sits on top of the old Fresh Kills Landfill on Staten Island is different. It will be three times the size of Central Park and will sit atop 50 years of trash produced by five boroughs.

Dan Glickman, 06/27/12

Vice President and Exec. Director of the Congressional Program, Aspen Institute; Senior Fellow, Bipartisan Policy Center.

Whatever the reasons, it's refreshing to see that on something, our elected representatives can get along (at least in the Senate) and the system can still work.

Joaquin Sosa, 06/27/12

Sierra Club 2012 Outdoor Youth Ambassador

During my last week of school this May, I got a surprise far better than good grades. A call from Sierra Club Headquarters in San Francisco confirmed that I had won the "Best Internship on Earth."

Francesco Fiondella, 06/27/12

Communications officer, International Research Institute for Climate and Society

The ability to predict seasonal changes in rainfall and temperatures, if effectively applied, could be one of the best adaptation strategies to climate variability and climate change in the Sahel and across sub-Saharan Africa.