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How Do We Know: Tracking C02 Emissions

Published: December 21st, 2010

Scientist David Crisp explains how NASA tracks regional carbon dioxide (CO2) emissions from space.

How Do We Know: Thinning Sea Ice

Published: November 29th, 2010

NASA scientist Ron Kwok details new technology he is using to monitor how extensively Arctic sea ice is melting from below, a key indicator of the ice's long-term stability.

How Do We Know: Drought

Published: September 28th, 2010

How do we know when a region may be experiencing an early drought? Dr. Heidi Cullen talks to NASA scientist Molly Brown, who relies on sophisticated satellites for the answer.