Videos Section

How Do We Know: Tracking C02 Emissions Watch Video

How Do We Know: Tracking C02 Emissions

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

How Do We Know: Thinning Sea Ice Watch Video

How Do We Know: Thinning Sea Ice

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.