1. The Atmospheric Infrared Sounder (AIRS), https://airs.jpl.nasa.gov/, 2020.
2. The Orbiting Carbon Observatory (OCO-2 and OCO-3), https://www.nasa.gov/mission_pages/oco2/index.html and https://www.jpl.nasa.gov/missions/orbiting-carbon-observatory-3-oco-3, 2020.
3. The Greenhouse Gases Observing Satellite (GOSAT), http://www.gosat.nies.go.jp/en/index.html, 2020.
4. The Mars Atmosphere and Volatile Evolution (MAVEN) mission, https://mars.nasa.gov/maven/, 2020.
5. The ExoMars Trace Gas Orbiter, https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/Exploration/ExoMars/Trace_Gas_Orbiter_instruments, 2020.