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I've heard of launching some large mirrors into orbit, or a bunch of small mirrors that can link together in orbit. Then you use them to reflect some sunlight off into space. I have no idea how practical this is. The bigger concern would be if something goes wrong, you need to make the mirrors deorbit quickly.

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You could set it so that some of the mirrors formed a parabolic collector and heated a molten salt column, etc on the surface.

That'd have the same net effect as the giant heat sink (energy production from a heat engine, net negative flow of energy to the surface).

Wasn't there a city builder that'd let you build such a thing, where it would sometimes lose calibration and burn a swath of the city to the ground?

Futurama had a similar joke (with a reflecting mirror, not a heat collector) https://gfycat.com/hatefulvariablekakapo

Sim City 2000 I think. Yeah, getting it back here is not great. And would defeat the purpose of lowering amount of solar radiation...

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