According to Professor Gary Shaffer of the University of Copenhagen we should stop burning fossil fuels now so that we will have enough coal, oil, and gas left when we need to fend off the next ice age over the next several hundred thousand years:
…for a management scenario whereby fossil fuel use was reduced globally by 20% in 2020 and 60% in 2050 (compared to 1990 levels), maximum global warming was less than one degree Celsius above present. Similar reductions in fossil fuel use have been proposed by various countries like Germany and Great Britain.
In this scenario, combustion pulses of large remaining fossil fuel reserves were then tailored to raise atmospheric CO2 content high and long enough to parry forcing of ice age onsets by summer radiation minima as long as possible. In this way our present equable interglacial climate was extended for about 500,000 years, three times as long as in the “business as usual” case.
Nice to see some people are cranking up their Buxton indices into the 100, 000 years range.