The assumption is completely different: We assume that our whole infrastructure is adapted to the climate state about 30-50 years ago. A change in the climate, how favourable it might be in the far future, means at first rebuilding and adapting. We have to clear whole countries like the Maledivas or the coral island states of the Southern Pacific, because they will be under water. We have to resettle the population of Florida and Bangladesh, because most of the land will turn into ocean or swamp. We have to give up all current beach site property, because the beach will be somewhere else. Real estate prices will shift tremendously, power balances will have to be balanced anew. Whole cultures have already crumbled because of subtle climate changes, and today, about 75% of the world populations are living in regions which will be directly affected by climate change. Maybe after some decades, all will be fine, and we might be able to farm in Antarctica, or some deserts have turned into wet lands, but until then, there will be turmoil.