Nuclear Winter

From Freeciv

Nuclear Winter occurs when Nuclear units have been exploded, and nuclear fallout has not been cleaned up.

[edit] Effects

Terrain begins changing into desert and tundra. Settlers, workers, and engineers must be given the clean fallout command to dispose of nuclear waste, which costs three settler-turns per square.

Is it possible to reverse this?

• No. However you can perform the converse operation with Global Warming. However, just like in real life, this tends to mess things up more than help (areas all become extremes).