Probably need to build up infrastructure like sea walls in areas that can be saved. Update flood prevention systems and dams, storm surge areas. Fund programs to breed seeds that are more heat tolerant. Model where future rains are going to occur and figure out how to manage, and store the water.
There are likely opportunities to terraform areas to level off temperature swings.
Ocean research is critical as well. They are getting f-up and we don’t understand them well at all. We need to collect dna for bio specimens that we can restore later when technology allows it.
Those things are a much better use of money than Current carbon reduction efforts.