I think his first point about carbon capture probably deserves more attention. It's likely the most sellable strategy and it also doesn't depend on the location where it is carried out. It has the benefits of possibly producing some goods that can be used and there is prior history of this working. If we look at the Paleocene–Eocene Thermal Maximum we see a similar increase in global temperatures due to carbon dioxide release, albeit over a much longer timeline. But we also see a drastic reduction of those carbon dioxide levels. One theory as to how the global CO2 levels were reduced is algal biosequestration. Can we duplicate this at an industrial scale? We're already promoting the growth of algae unintentionally with fertilizer runoff, could we do this intentionally in a location that would minimize harm in order to offset carbon emissions?