From The Daily Beast:
"The Norwegians coined a phrase for such projects, calling them stormannsgalskap, or “the madness of great men.” While the term was meant to be disparaging, it might very well become a badge of honor in the future. If rising carbon levels are left unchecked, the world will need pioneering innovation. It will need great individuals who are willing to defy governments and do what is necessary to make hard, bold choices.
But better yet, let’s do that now.
Even if one of these massive geoengineering projects could be developed, financed, and implemented in the future, the question arises whether it will do more harm than good. When you’re talking about trying to control climate via an engineering project, there are a thousand variables at play. Pull the wrong string and everything could unravel. An international team of researchers ran models for a dozen different geoengineering projects and concluded that such massive endeavors would likely have disastrous unintended consequences. Their final conclusion was even more disturbing. Even if a project was successful at controlling carbon levels for 50 years, once the project was stopped, the rebound effect could actually accelerate climate change."