US per capita consumption/energy also higher. Just from energy perspective, US trending towards 150M more population by 2100 is equivalent to 1.8B Indians and 900M Chinese. PRC population is set to decline, and probably India's as well. Canada is like 50% more than US baseline, Norway 300%, Iceland 500% but not much immigration there.
Every individual migrating from developing world to developing world is increasing energy use of that person substantially even considering that (a typically skilled) migrant is likely a higher tier consumer in their origin country. Or that moving to a high consumption economy has greater compounding effects in terms of knockon consumption, i.e. 40% of RMB spent in PRC goes towards consumption vs 70% (?) for US. I joke that the most enviromental way to be a consumer is to buy developing countries with poor consumption or huge savigns rate because they're simply less likely to recycle that profit into more excessive consumption.
Every individual migrating from developing world to developing world is increasing energy use of that person substantially even considering that (a typically skilled) migrant is likely a higher tier consumer in their origin country. Or that moving to a high consumption economy has greater compounding effects in terms of knockon consumption, i.e. 40% of RMB spent in PRC goes towards consumption vs 70% (?) for US. I joke that the most enviromental way to be a consumer is to buy developing countries with poor consumption or huge savigns rate because they're simply less likely to recycle that profit into more excessive consumption.