Canadian Inuit activist and Nobel Prize nominee Sheila Watt-Cloutier says those at the top of the world acutely feel the effects of global warming. See her interview.

Climatologist Konrad Steffen talks about the surprising speed of ice loss in Greenland. Steffen, a professor at the University of Colorado, has spent each summer for 27 years measuring changes to the Greenland ice sheet. Watch his interview.

Josh Dorfman, author of The Lazy Environmentalist, explains that fighting climate change doesn't require busy, stressed-out people to change their nature. He provides tips on finding environmentally friendly goods and services. Watch his interview.

Photographer James Balog talks about the Extreme Ice Survey, which employs dozens of cameras shooting photos every hour during daylight to record melting glaciers in the northern hemisphere. See his interview and photos.

National Geographic Emerging Explorer Alexandra Cousteau discusses climate change and the oceans, and how individuals can make a difference. See her interview.

Naturalist E. O. Wilson warns that climate change will lead to greater loss of habitat and increased species loss if action isn't taken. See the interview.

Dozens of researchers, activists, and explorers gather this week at the Aspen Environment Forum to discuss global climate change. The speakers and panelists are talking about current signs, what the future might look like, and what might be done to lessen the impact.

"The effect [of global warming] on biological diversity could be catastrophic, and it would be a form of habitat loss that rivals that caused by deforestation," says naturalist E. O. Wilson. "We're headed for a brick wall ... and we want to hit it at a survivable speed."

Despite his concern, Wilson maintains a sense of optimism shared by others at the conference. You can see our interviews with individual speakers here—and you can watch sessions from the conference at the Aspen Institute's site.

Our site's visitors have also contributed to our coverage. In this video edited by producer John Kondis, you can see photos from the natural world submitted by Your Shot photographers. The represent just a small sample of what's at risk as we see accelerating climate change, and what's worth protecting.