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Nothing. That's because I disagree with the assumptions of this question. I don't believe that humanity needs saving. Yes, we are experiencing tough and troubled times at the moment--global warming, tensions in world politics, a refugee crisis, and other horrible human events. Nonetheless, I believe these are problems that human beings can solve or, at least, will be able survive. 

We don't need to be saved. We simply need to continue living our lives, doing the best we can to make our lives and the lives of those around us better, helping others when we can, and of course, doing our best not hurt others, too.