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Last week’s negotiating session resulted in the UN’s climate expert body giving a reluctant nod of support to a controversial – and largely theoretical – geoengineering technique known as BECCS (Bioenergy with Carbon Capture and Storage). Geoengineering refers to extreme technological fixes that aim to alter the climate on a large scale. In its report approved Saturday April 12, Working Group III (WGIII) of the Intergovernmental Panel on Climate Change (IPCC) largely – and wisely – bypassed geoengineering, but did suggest that BECCS is a bitter pill that a warming world could find itself having to swallow. BECCS and other Carbon Dioxide Removal (CDR) technologies will be especially needed, according to the IPCC, in “overshoot” scenarios, where mitigation of greenhouse gas emissions is delayed or inadequate, necessitating faster, deeper emissions cuts in the long run to limit temperature rise. The IPCC notes that “overshoot,” in general, makes it less likely that any given temperature goal will be met.