I'm not worried about long term trends in terms of wealth, but the curve in the hockey stick is because of oil. Exponential returns on labor for drilling into the ground. Oil will still probably be better than solar for a long time in a lot of regards - energy density, ease of energy release, abundance, cost. Problem is, all that oil use is definitely having an impact on the world's environment, and the environment is the source of every red cent of wealth ever generated.