Giegengack contends that natural warming periods in our planet’s past have triggered the release of CO2 into the atmosphere from ocean- and land-based reservoirs, and that the most significant consequence of human fossil-fuel consumption is that we have altered that balance by pouring CO2 into the atmosphere and those terrestrial reservoirs simultaneously. Since that relationship has been disturbed, he says, even a drastic reduction in CO2 pollution may not restore the natural dynamic.