There have always been changes in the climate over the last few million years, the only difference now is the population increase, with a subsequent increase in dryness and the planet is in a warming period
The Rio Grande river in early times had steam boats going 350mls up the river with the small ones going another 350 mls but now it does not even flow into the ocean - not enough water
Many world rivers are the same, a combination of less rain and much greater use of the water
There is only one method of GW repair and that apparently is being done courtesy of that bloke who built computers currently IE reduce the population by 50%
