They say that every cloud has a silver lining. If future energy consumption (which is mostly fossil fuel) drops because of a financial collapse brought on by high oil prices and other limits, then, at least in theory, climate change should be less of a problem. One of the important variables in climate change models is the amount of carbon dioxide from the burning of fossil fuels that enters the atmosphere. In a recent post (Peak Oil Demand is Already a Huge Problem), I showed the following estimate of future energy consumption.
I explained in that post that oil limits are different from what most people expect. Oil limits are price limits. Indirectly because of these price limits, fuel consumption of all sorts (not just oil) will decline in the near future. The problem will be greater job loss and an inability to afford products of many kinds, including those made with fossil fuels. Financial collapse, particularly of governments, and a long-term decline in population are also part of this scenario.
My estimate of CO2 generation by fossil fuels in the 21st century is only about one-quarter of the amount (range midpoint) assumed in the 2007 Intergovernmental Panel on Climate Change (IPCC) Report. When differences in estimates of an important variable are this far apart, one starts reaching the “Garbage in, garbage out” problem. This is a persistent problem for all modelers. Even if the climate model is perfect apart from its estimate of future CO2 fossil fuel use, and even if anthropogenic issues are implicated as a cause of recent climate changes, the model with its incorrect estimate of future fossil fuel energy consumption can still be unhelpful for determining needed future actions.
A comparison of energy consumption estimates is shown in Figure 2. My estimate of energy consumption (similar to that in Figure 1) is shown as the Collapse scenario.