Well, at least until somebody devises a system that transports or projects it so that the heat ends up somewhere not-Earth. It'd still be heating the universe in general, of course, even in the form of sprays of neutrinos.

That reminds me of a sci-fi book, Sundiver by David Brin, where a ship is exploring the sun by firing a "refrigerator laser" to somehow pump-away excess heat and balance on the thrust.