Considering that future generations will be far better off than current generations even after accounting for climate change, it would be more equitable for today's industrialized world to help solve the real problems facing today's poorer developing world than to mitigate climate change now to help reduce the burden on future populations that would not only be wealthier but also technologically superior.
Strictly from the perspective of human well-being, the richest-but-warmest world characterized by the A1FI scenario would probably be superior to the poorer-but-cooler worlds at least through 2085, particularly if one considers the numerous ways GDP per capita advances human well-being.
Agricultural demand for water - probably the largest threat to freshwater species - continues to increase. ... Meanwhile, threats to terrestrial biodiversity - primarily the conversion of habitat to agricultural uses ... - have not diminished.
