For those living in Asia and other parts of the world where big cities generally = bad to dangerously bad air, the idea of putting more stuff in the atmosphere because global warming sounds like an intuitively bad idea. That is before getting to the fact that there is no meaningful regulation of geoengineering, that there are serious questions as to whether the effects of any operations can be contained, and the standards for determining effectiveness versus harm. This like GMOs is on its way to become a great experiment upon the general public without consents or controls.