George Monbiot writes in yesterday's Guardian ("The planet is now so vandalised that only total energy renewal can save us", 25/11/08) saying that to prevent runaway climate change we need a total decarbonisation of our economy.
This is correct. Emission cuts on their own will not deliver the mitigation of climate change that we need.
"Mitigation" is a widely brandished term to talk about how to combat climate change. We talk of a "mitigation model" to prevent our planet from warming, and usually this involves CO2 emission cuts, in the hope that we lessen the damage we are causing to the environment. This is not the same as reversing it.
We can take the analogy of an obese person who is getting fatter and fatter every day because they eat 20 hamburgers a day. Telling them to cut their intake and eat 10 burgers a day instead, will help them decrease the rate at which they are putting on weight, but it will not be a recipe for slimming. If they are more drastic and cut their intake to just a few a day, that will bring them closer to a stable situation, but to reverse this and start slimming requires other ingredients in their life, such as physical exercise.
Our atmosphere has a concentration of greenhouse gases of 430 ppm in CO2 equivalent, which is tremendously high, and very close to the threshold of 450 ppm that is widely accepted to be a point where climate change can begin to take a very dramatic turn. It is time to start slimming. Eating fewer burgers or cutting down our emissions will not do the job. Any threshold of CO2 emissions, however low, is a form of environmental vandalism and adds to the already existing problem.
The high concentration of greenhouse gases is already retaining an excess of heat in our planet and will continue to do so for the foreseeable future (see our article on global warming).
Even if the UK's Climate Change Bill delivers the target of 80% emission cuts by 2050 and the world joins in with the successor of Kyoto (to be decided in Copenhagen next year) delivering the same level of cuts as the UK (which is very unlikely and over-optimistic), then all we will be able to say is that we have vandalised the environment much less than we would otherwise have done, but the problem of global warming in 2050 will still be much worse than it is now in any event, because during 4 decades of emission cuts there will be emissions nonetheless.
The crux of the matter is that to reverse the problem we must have negative net emissions. This means that our target must be to go beyond zero emissions, beyond decarbonisation and being simply carbon neutral, we must look into capturing carbon from the atmosphere on quite a gargantuan scale.
The world has lost most of its forests in the last century. Redressing the balance involves a reforestation process on a vast and fast scale, in order to dramatically increase the Earth's ability to capture carbon from the atmosphere. The UN's working group on Climate Change has suggested financial compensations to tropical countries who halt deforestation and illegal logging. This is encouraging but not strong enough. Deforestation must stop immediately and we ought to be putting all our financial resources on a very ambitious and long-term reforestation effort.
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