20k years ago seattle, chicago, and new york were under a sheet of ice a mile thick. the sea levels were 400 feet lower than they are now. this has happened 17 times in the last million years. if the pattern holds true, we have another 5k to 10k years of warming (a few degrees) before the temperatures peak, and sea levels rise about 200 feet. the whole cycle takes about 60k years. if you want to "plan" 100+ years in the future, then go for it. you can start by making your house out of large stone blocks at least 300 feet above sea level, and near a decent sized natural river, (but not too near).
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