Henry Cisneros, former U.S. Secretary of Housing, on 'new urbanism.' What it means is front porches, back yards, green space, sidewalks that work...

Dr. Babs Soller has worked for a decade on a wearable, non-invasive sensor that uses light to measure the metabolic rates of astronauts. She said data from this sensor could be used for hospital patients on Earth to avoid life-threatening situations.

We and Earth are part of a single system. We affect nature, and nature affects us, in endless cycles.

The president of a forestry consulting firm talks about the market for carbon offsets - tradeable measures of a forest's proven capacity to store carbon. Find out how it works.

No one - not scientists, not environmentalists, not policy makers - wants an ecological catastrophe. No one wants to see people hungry, either. Read about the GM wars.

Biologist and author Paul Ehrlich talks about the single biggest step forward in all of human history. Read more about human culture and its evolution.

Paul Ehrlich of Stanford explains his ideas on why we humans dominate Earth. He says that our genetic evolution gave us things like dextrous fingers and binocular vision, but what put us over the top was our cultural evolution.

Harvard's Yang Liu talks about how satellites in space can provide scientists and medical researchers with information they need on air pollution and human health in this 8-minute *EarthSky Clear Voices for Science* podcast.

Looking to offset your carbon emissions? Now you can with confidence, thanks to a new online list of vetted, high-quality...

Nuclear engineer Erich Schneider responds to a question asked by a student from Cote d'Ivoire about the purpose of nuclear power.