The Club of Rome's "Limits To Growth" study in the 1970s, in its central scenario, had the 2040s as the time when we'd start to really feel the consequences of

The Club of Rome's "Limits To Growth" study in the 1970s, in its central scenario, had the 2040s as the time when we'd start to really feel the consequences of "pollution" (broadly conceived, including things like fossil water drawdown and soil exhaustion as well as the results of using fossil fuels). A little faster than expected maybe. Not all that much though.