Andrew Maynard, of 2020 Science, writes this very interesting blog post on the need of a new field called "Geoethics" to compliment the emerging field of geoengineering. Andrew provides some insightful commentary:

"If we are going to get geoengineering right—and I think in the long-run it is as important as it is inevitable—we are going to need some serious ethical input to its development and application.  And while I generally avoid artificially slicing and dicing ethics, I think it would be no bad thing to further develop the idea of geoethics, as dealing with the appropriateness of decisions that affect societies on a global scale, and possibly over many lifetimes.

"Of course, the concept of geoethics isn’t new—it’s been around in one form or another for decades, usually in the context of general anthropomorphic environmental impacts.  But to my mind the potential impact of geoengineering is such that it is going to need it’s own ethical framework that enables people to agree on a wise course of action.