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1.
When a nuclear/atomic bomb is dropped, the smoke from the all the energy rises up and resembles that of a mushroom.

When many nuclear/atomic bombs are dropped, you now have what resembles that of a Mushroom Garden.
1. Japan decides to attack United States again for whatever reason, seeing as how they didn't learn the 1st time when only 2 bombs were dropped. This time United States drop a nuclear bomb on every single Japanese city; Japan now resemble a Mushroom Garden.

2. WW3 has went nuclear, every country that posses nuclear weapons launches them at their adversaries; the world now resembles a Mushroom Garden.
by iamwhoiamnot November 06, 2010