Imagine.
Mankind sending massive solar panels to float in the sky. The size of a small town, the arrays are capable of harvesting sunlight enough to power a machine that creates clouds. Think of the solar arrays being positioned into orbit; into places across the planet that are in desperate need of water. With the rain maker high in the atmosphere, (carried there by balloons the size of jumbo jets) clouds begin to appear. Soon, wisps become Nimbus. Thunder and lightning follows. And then, just like nature does it, the ground flows the rivers of life.
It is beyond my imagination how the apparatus can wipe out global famine, or stop bush fires from spreading. I do not know if it can ease the worse effects of heatwave or it can grow forests and jungles out of barren lands. It is beyond my thinking if it can resolve humanity's problems, especially its need for clean, drinking water. But who knows. We have eliminated Polio from the face of the earth and made correspondence faster with Internet.
All I'm saying is that I had a vision, while looking at my seatmate's fancy Iphone as the vehicle we found ourselves crosses a dead river, in a city that is becoming less and less breathable with more lives it takes in.