…require massive deployment of Biomass Energy with Carbon Capture and Storage (BECCS)…growing biomass which is used to generate power and geologically sequestering the carbon dioxide produced. While the constituent steps of this process have been demonstrated, there are but a few, small, examples of the combined process. To rely on this technique to deliver us from climate change is to demonstrate a degree of faith that is out of keeping with scientific rigour.
There’s distinct lack of evidence to determine whether BECCS is technically feasible, economically affordable, environmentally benign, socially acceptable and politically viable at a material scale
Policymakers can only hope to develop realistic plans, if basis on which they are making those plans is itself realistic. …negative emissions amounting to 600-800 billion tonnes of carbon dioxide (equivalent to 15-20 years of current annual emissions) is clearly more than a stretch goal. For this reason, negative emission techniques should be excluded from the mitigation scenarios used by the IPCC unless and until there is sufficient evidence to warrant their inclusion and then only on a scale that is demonstrably realistic.