Artwork: The satellites would build a global map every five days (clouds permitting)
German manufacturer OHB-System has signed a €445m (£400m) contract to begin construction of a satellite network to monitor carbon dioxide.
The CO2M constellation will consist in the first instance of two spacecraft, but there is an option for a third.
The platforms will track the greenhouse gas across the globe, helping nations assess the scale of their emissions.
Under the Paris climate accord, countries must compile CO2 inventories. CO2M will provide supporting data.
The aim is to launch the OHB spacecraft in 2025 so they can inform the international stocktake that will report in 2028.
CO2M falls under the