I find it difficult to fathom why people think geoengineering is feasible.
In terms of cost, effort, technical know-how and potential risk, there seems to be a clear hierarchy of options:
1. Conservation/efficiency - do more with less
2. Alternative sources - biofuels, algae, solar, thermal storage etc
3. Geo-engineering - deal with the consequences of failing on 1 and 2
4. Colonize another planet - !!!
If people can't be convinced to make even the smallest dent in their lifestyle to support the costs of doing 1 and 2, what on earth makes anyone think taxpayers will be willing to fund the true cost of 3 (or 4)?
Talk about jumping the shark.