Sorry, there is nothing that you can do that would make a significant difference.
There are some that will say, "If everyone would just..." But it is impossible to get everyone or every nation to work to decrease global temperatures and sea level rise.
Present human activities will continue; ocean pollution and acidification, population increases, proliferation of weapons of mass destruction, penicillin resistance, production of new (and old) deadly chemicals, over-fishing the oceans, infrastructure deterioration, aquifer depletion, choking landfills and of course, burning of fossil fuels.
Almost every nation will continue getting farther into debt faster than its economy can grow, refuse to shield their electric infrastructure from solar flares, continue deforestation and importing foreign species.
► The best that you can do is to take steps to protect yourself and your loved ones.