This is an artist’s concept of the Jason Continuity of Service (Jason-CS) mission on the Sentinel-6 spacecraft. (Spacecraft model courtesy of ESA/Airbus; artistic rendition by NASA/JPL) The builds on four previous satellites that have circled the globe along the same path since 1992, carefully documenting the millimeter-by-millimeter changes in sea level fueled by greenhouse gas emissions. Over that time, they have found that the world’s oceans are rising at an increasingly rapid rate. The first Sentinel spacecraft in a clean room in Germany. The satellite is scheduled to launch in November.