How Can Satellites Save The World From Natural Disasters

Technology could be so beneficial for humankind yet disruptive to our environment. In recent years more people are aware of this and have started looking for alternative sustainable energy sources in order to stop damaging our environment any further, what have we invented so far to reach our goal? But at the same time, technology like satellites could be the key for humans to protect our land from natural disasters such as floods, how is this possible?