Quite, and we've never tried geoengineering on a global scale. We've had enough problems from localised changes from agriculture or introduced species. To your

Quite, and we've never tried geoengineering on a global scale. We've had enough problems from localised changes from agriculture or introduced species. To your second point I've always preferred climate change as a term over global warming as some areas will end up cooler, others more changeable. Especially if one of the major ocean current systems slows or stops.