In the face of advancing climate change, we drastically need to monitor and understand the various sources and sinks of greenhouse gases worldwide in real time. One focus to accomplish this is to regulate and monitor man-made methane emissions. Laser systems, as developed by researchers at Fraunhofer ILT, offer ways to do exactly this: At the heart of LIDAR instruments, they can precisely determine greenhouse gases in the atmosphere with high spatial and temporal resolution, even from great distances, and do so worldwide.