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No. of Recommendations: 5
However, the point was that there have been megadroughts (not to mention episodes such as the 1930s and 1950s) without enhanced CO2 forcing. So, severe drought "might not end with curbed greenhouse gas emissions".

They measured the Colorado River water flows to make estimates for future water allocations back in the 1930s. However, by chance this turned out to be historic wet period, so their future flow estimates even including a generous safety factor were far too high. Basically, there are more demands on river water than there is water. So yes, curbing greenhouse emissions might not be the solution here. In any event, peak CO2 is coming decades in the future, so I think this is a secular problem.

It should be noted however that in the 1980s there was so much water Glen Canyon dam was almost overtopped.
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