All of that happened within a band of atmospheric CO2 concentrations between 180 - 300 ppm over the last 800,000 years...we're now at 416 ppm and climbing...if we keep on burning FFs at the current rate, we'll be hitting 900 ppm by the end of the century...how many major human 'encampments' are built on the world's coasts?...how many currently fertile growing areas will remain so?
Given that we have alternative energy sources that don't pump out CO2, why persist in using FFs?...especially since they are definitely 'Finite'...(BP says <50 yrs of global reserves).