Solution to the Deserts.

Terrain "terraforming" was a feature in Civ II. Settler/workers were one unit that built improvements and also founded cities. With the discovery of a certain tech (biology?) they upgraded to Engineers with double movement and the ability to transform tiles (desert/tundra to plains; plains to grassland; grassland to hills; etc). Upgrading Workers to Engineers with the ability to transform tiles seems like a simple solution.
 
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