Some plants are simply better at making use of their water supply than others. More efficient plants can capture more carbon with less water, which has implications for carbon sequestration and ultimately for climate change modeling. In other words, the more we understand about water use efficiency, the more reliable our climate change models can be. And the only way to measure efficiency at the global scale is from space. On this episode of Eyes on Earth, we hear from a scientist who studied global water use using a sensor called ECOSTRESS, whose data are housed at the USGS EROS Center, in NASA’s Land Processes Distributed Active Archive Center (LP DAAC).