Satellites can see more from Space and also visit/fly over areas multiple times. In this way we can not only do better measurements over all of the world but also repeat these measurements to see trends. This is how our knowledge of the Weather systems and also the global warming phenomenon is improving.
We can study all sorts of things from a satellite:
-ocean currents, salinity (saltiness), and other chemistry and how they’re changing due to climate change
-motion from earthquakes
-cities and how they’re changing
These help us make huge global networks to monitor things like natural disasters, figure out good city planning, and keep an eye on climate change.