Instead of self-imposing pseudo-malthusian constraints, why can't we just embrace the fact that we are geo-engineering on a massive scale and actively do it instead of the accidental kind we have right now? It would only take an increase in tree biomass of 1.5% to offset human CO2 production. Phytoplankton stimulation would be an incredibly cost effective method to counteract human industrial activity yet why is it completely ignored in favor of regulating everything and constraining progress?