Most anthropogenic greenhouse gas emissions are the result of the combustion of fossil fuels. Proposals for mitigating climate change thus include various carbon dioxide removal technologies, replacement of fossil fuels by non-carbon alternatives (renewable and nuclear energy), and reduction in energy use overall by improving energy efficiency. We argue here that deep controversy surrounds the efficacy and likely costs of all these technical fix proposals. Optimistic conclusions are often drawn for these technical solutions partly because many of the analyses do not follow an Earth Systems Science approach. Instead, we argue that in future solutions based on non-technical solutions will need to be a key approach for mitigating climate change in the short time frame we have left.
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