How will the world's sanitation departments deal with the poop of 7 billion people?
October 25, 2011, 4:40 p.m. by Livescience.com Inc.
Population growth everywhere is putting pressure on sewage systems and highlighting the need for latrines in rural areas and urban slums.
Global population expected to hit 7 billion by the end of October
October 13, 2011, 5:39 p.m. by Stephanie Pappas, LiveScience
A look at 7 population milestones in anticipation of the 7 billionth person.
Earth is over budget: We've used up all our natural resources for the year
September 27, 2011, 2:40 p.m. by Stephanie Pappas, LiveScience
Today marks Earth Overshoot Day, according to the Global Footprint Network. That means humans have officially used more natural resources in a year than the Earth can replenish.
Cash for corals (or why a piece of pristine coral is like a $20 bill)
April 19, 2011, 1:52 p.m. by Chris Turner
For more than a century, a key tenet of environmentalism has been that you can't put a price tag on nature. An emerging body of scholarship suggests the best way to preserve biodiversity might be instead to assign it a dollar value.
Scary math: Carbon dioxide emissions and affluence
December 16, 2010, 10:03 a.m. by Nature Conservancy
The impact humans have on the Earth's resources can be calculated by a simple equation using basic arithmetic.
Americans choose sun over water: Why that's bad news
November 23, 2010, 3:30 p.m. by Nature Conservancy
Which do you prefer: abundant blue skies or abundant blue (fresh) water? It may be hard to have both, especially as climate change continues.