Don't try to slow the change or stabilize the environment - instead get better at adaptation.

If we live in the sea anyway, rising sea levels aren't harmful. If we (and our main food supplies) can survive in a range of temperatures, we do so rather than trying to control the temperatures. As an added benefit, if we're more adaptable, it likely makes it way easier to colonize (by having to terraform a bit less) other planets.

hey, you said "crazy". Note that this probably shouldn't be either/or, it could be in parallel with stabilizing/controlling the environment.