There is carbon all around us. The trees, grasses, crops, all the vegetation and soils on the Earth's surface store carbon. About three or four times as much in the atmosphere. As a whole, the land surface is absorbing one quarter of the carbon we emit from fossil fuels. Will it continue? I'm George Hurtt, professor at University of Maryland and leader of NASA's Carbon Monitoring System. We are developing technologies to monitor and model carbon with sufficient precision to reduce uncertainties and support decision making.