Another option is to smash stuff into the Moon. I mean, smashing enough stuff directly into Earth to alter Earth's orbit tends to ... ehh ... make the entire exercise moot.
But smash stuff into the Moon, and Earth gets tugged along for the ride without the Judgement Day side effects.
You could set up a mass launcher on Iapetus to shoot ice projectiles at the Moon...
Locking nitrogen in rock decreases the atmospheric pressure; which reduces the greenhouse effect and gives more time before the oceans boil (but reduce the N2 pressure too far and everything catches fire, then the oceans boil).
@michael_w_busch@bruces@nyrath A really advanced civilization could mine the sun's core for helium and fuse that into material for building megastructures.
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