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Originally Posted by Professor Tanhauser
The other would be more figurative, but would involve rendering it useless, or at least destroying the biosphere.
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Figurative would be the perceptual destruction of the world. Like what happened to the Mayans.
Toxic Memes has rules that might cover this.
As for your other methods, you are forgetting one far simpler one. Any spacefaring civilization can strap a drive to any old object and plow it into a planet. Settings with spacecraft capable of interstellar speeds should be able to smash planets with a single junked freighter, see my example upthread.