The technology I'm most excited about is advances in radiative cooling. Basically with materials science we can create perfectly reflective surfaces which emit Infrared energy out to space through the atmospheric window. It's both a local mitigation in that it could keep us cool as shit gets out of hand, while also getting the excess energy out of Earth's system. I feel like with industrial scale it could be feasible and get us off of energy-heavy AC and replace some of the lost albedo from the ice caps. 10C below ambient is super impressive IMO.
https://www.sciencedirect.com/science/article/pii/S254243511...