[taneq]

> Any control theory guys out there with suggestions?

Nothing small and cheap. We've been applying a massive forcing effect by adding billions of tons of CO2 per year to the atmosphere over decades. It's going to require a commensurate amount of effort, at the very least, to swing the needle back in the other direction.

Our best bet might be something crazy like using nukes to set off volcanoes to generate an ongoing low level 'nuclear winter' type effect. We'd have to be careful to pick the right volcanoes, though, to minimize the CO2 emitted by said volcanoes.