Looking at Earth’s Climate

Tom Karl, L.H.D., shares his passion for observing and understanding our planet’s climate. Explore widely-shared questions about past, present and future states of the Earth’s climate. How do we look at Earth's climate? What do we know, and how do we know it? What are the limitations of our knowledge? Hear how the U.S. Global Change Research Program and the U.S. National Oceanic and Atmospheric Administration (NOAA) are addressing these vital questions, and how the answers impact our lives and livelihoods.