When your territory is saturated with pollution, rainfall is not going to help. Air is already a problem is some parts of China. So water ? They will eventual

When your territory is saturated with pollution, rainfall is not going to help. Air is already a problem is some parts of China. So water ? They will eventually need to choose between their industries and water. And they will choose their industries. Their gov knew this, and made a bet on Tibet. Now, because India gets most of Tibet's water, they had to hide the plan behind something that made sense. And they did had a problem with part of the Buddhist community, so they killed 2 birds with one stone.