If, however, still allow the attack of the apocalypse of humanity in the face of global warming, but this all goes, we will accept it as fact and deal with its consequences. Of course, no clear method is not, because our Civilization has not faced the same problem, but I will try to bring a number of ways to reduce harm from warming, which seem to me reasonable. Firstly, I think, will have to choose a new place to live, Of course, if you do not live in such. Because of global warming in ocean water levels will rise rapidly due to melting glaciers, and will be higher, at least one meter, but is likely much higher. Therefore, life near the river channels will be impossible, since they will behave unpredictably. This is especially true of the rivers originating in the mountains, as they will be affected first. Anyway, if we assume that all the water on the Planet somehow connected, it is better to stay away from any of its manifestations.
Here is a simple chain: Increased water in the ocean will increase its area, evaporation will increase, there will be more rain, and they become stronger, the river to draw water from the fields etc. during its course to become affluent, the lake, which flow into the river, just change its shape in the direction of consolidation. The ideal option would be relocation inland, where not so much to heat and cold ocean currents (and they just change), and sea level will not rise so much that to get there. The same should stay away from tropical forests and other sources of disease, as warm, moist air – an ideal breeding ground for viruses and bacteria, germs of deadly diseases. Secondly, you need to take care of their subsistence and the availability of drinking water. Due to global warming persists, do not having to adapt, many species, edible plants and animals, so care should be taken and select the most resistant to further cultivation in your 'safe place'. So it was reasonable to take care of the presence of a spring there, or self-drill or dig a well. And finally. Not to give a general panic, which is simply unavoidable. There is always a way out of any, but also very unfortunate situation.