Climate Engineering: Great Concept or God's Artifact?

Climate engineering raises many questions and mostly ethical questions.
1) If it's a solution of last resort when global warming will become too dire to be fought by the traditional channels of international binding framework, carbon tax and cap-and-trade schemes, WHY NOT.
2) If it's just a quick and cheap fix to solve global warming, NOT THE BEST IDEA. The danger is to take it as a miracle cure. As a result, all efforts to frame a pro-active international agreement and set a high enough price on carbon to reduce greenhouse gas (GHG) emissions would be abandoned by lack of incentives.
3) If it's opening a Pandora box to climate wars: a new weapon in the hands of terrorist organizations or great power games, and pave the way to governmental manipulations, of course this is an absolute NO.
Who would regulate at the international level such geo-engineering?

Climate engineering involves pumping sulfates or other particles into the atmosphere to block sunlight and cool-down temperatures. It can also mean creating an artificial cloud cover or altering clouds to reflect light back into space. In a nutshell, it also means that governments would make good weather, rain or snow at their will.