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Nobody is going to war because of global warming. People affected by land loss will not drown, but slowly migrate over time. Heck, most people can probably live out the rest of their lives where they are, with their descendants planning for a future of higher ocean levels.
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Um, no - much of the war in east Africa and in Syria are caused by loss of water, and in places like Bangladesh, the loss of land is affecting millions of people. Syria had an extended drought, which drove many farmers into the cities - and this is happening in many other places, too.
The US military has climate change very high on the list of threats to security. At Norfolk - the largest naval base in the world, they have had to spend millions and millions to RAISE the piers, and people who live in that area have been seeing LOTS of flooding, and they have spent lots of money repairing flood damage. They are faced with LOSS of insurance - and if they can stay insured, the premiums have increased a lot.
Insurance companies can read their actuarial charts, and see the increasing risks. Miami is flooding almost every month. Sea walls and highways are being damaged and destroyed more and more frequently. Boston is considering "reverse" canals - where the water is held away from the buildings. Which is nuts.
Ground water is getting more and more salt water infiltration, in Florida and other places. So, even if you put buildings on piers, where are you going to get water, and where will your sewage go? Florida is corral based land - and you CANNOT built a seawall and keep out the ocean.
Vermont is still rebuilding some of their roads and buildings, after they got hit with 7+ inches of rain in just a few hours, back with a tropical storm called Irene. They didn't have enough gravel in the state to rebuild their roads - they had to truck in from surrounding states. They lost 40+ feet of road beds. In Pakistan, they got 30+ inches of rain in about 3 days - and this washed away several cities and all the roads and bridges were unusable. Something like 12 million people were made homeless in just a few days rain.
Maryland recently has also seen 4+ feet flash floods washing out main streets after several hours of rain. Tornadoes happen all year, now. And wild fires are bigger and more intense and have a much longer season, than in anybody's memory.
Tundra is melting - and it is releasing a lot of carbon dioxide and methane - sometimes violently. Arctic ice volume in September, has hit LESS THAN 20% of what it was in 1980. Antarctic ice is now down a lot from what is was in the 1980's; after hitting a high in 2013 and 2014.