Chris Field on developing world greenhouse gases

Chris Field is optimistic that poor and wealthy countries can cooperate on reducing emissions while still allowing for economic growth.

Online discussion today on population and climate change

How do population dynamics figure into the conversations about climate? Join this online discussion today.

Norman Loeb studies clouds’ effect on Earth’s climate

"I think society needs to realize the importance of accurately measuring the climate system ," says Norman Loeb when talking about the goals of CERES mission.

Scott Barrett on crafting a successful climate agreement in Copenhagen

"The biggest problem we've had in this long history of climate negotiations is a focus on targets and timetables - on aspirations," says Scott Barrett.

Balloons: How high can they fly?

Helium balloons rise higher than hot air balloons. The current altitude record for a helium balloon was set by Malcolm Ross, who flew to over 113,000 feet.

What causes the colors in flames?

When you gaze at a wood fire, you might notice different colors in flames. What causes them? It's like the colors of stars indicate their temperatures.

Is twilight shorter at the equator?

The sun drops quickly down toward the horizon - and just as quickly sinks below the horizon - as seen from Earth's equatorial latitudes.

Nancy Moreno on butterflies launched into space

Nancy Moreno explained that the butterflies in space experiment will help scientists - and students - understand how gravity influences growth.

‘Mowing the lawn’ at high altitude

The ICE Bridge mission - dubbed "mowing the lawn" has been so successful that eight flights will be added keeping us in Chile until Thanksgiving.

Peter Gleick warns that world faces a water crisis

Forty percent of the world's population doesn't have access to adequate sanitation services, says water expert Peter Gleick.