“…In recent decades, observing the Earth from space has profoundly changed our outlook on the planet and its environment. While providing a better knowledge of the different components of the “Earth system” (solid globe, oceans, atmosphere, ice and land surface), space observation also makes it possible to follow the global changes to which the planet is subjected under the effect of phenomena. natural and human activities. …”

“…The access, purification, and reuse of water on our planet, which is of course not endless ..…”