Yes, the costs are not evenly spread. Some places will do better and some will do worse. The American South might be a worse place to grow wheat; Southern Canada might be a better one. In a century, Miami might find itself in approximately the same situation as the Dutch city of Rotterdam today.
But spread over a century, the costs of moving and adapting are not as imposing as they seem. Rotterdam’s dikes are expensive, but not prohibitively so. Most buildings are rebuilt about every 50 years. If we simply stopped building in flood-prone areas and started building on higher ground, even the costs of moving cities would be bearable. Migration is costly. But much of the world’s population moved from farms to cities in the 20th century. Allowing people to move to better climates in the 21st will be equally possible. Such investments in climate adaptation are small compared with the investments we will regularly make in houses, businesses, infrastructure and education.
And economics is the central question—unlike with other environmental problems such as chemical pollution. Carbon dioxide hurts nobody’s health. It’s good for plants