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the biggest problem with terraforming the Sahara would be the environmental domino effect it would create. The Sahara’s sand gets carried in the air by wind power and is deposited in South America after crossing the Atlantic Ocean. The dust picks up moisture during its journey, and when it falls from the sky – rain comes along with it.
This dust and rain combo falls on the Amazon rainforest, helping to fertilize it and providing the ecosystem the water that it needs. No Sahara could potentially mean no more Amazon rainforest unless someone else steps in with a plan to avert that crisis.