WRT your third paragraph, you seem to be lumping a whole load of very diverse opinions together then criticising them as a whole, when in fact many environmentalists don't want the measures which governments are advocating. Governments and politicians want them because (a) they don't want to take bold action, because that might backfire at the polls, and (b) if they get a chance to surreptitiously increase their power over other people, well, that's what politicians do, isn't it? There's also (c) the issue of corporate manipulation of the so-called "green agenda", to the point where profits are more important than environmental problems, however serious they might look.
Engineering solutions are, or are not, a solution depending on who you talk to. I'm worried that too many people want to cash in on the problem by offering snake-oil solutions which can't be tested in advance, like this one:
http://blog.wired.com/wiredscience/2008/02/geoengineering.ht...
If you can't test it, don't kid yourself that a big roll of the dice is going to help in any way. (And remember, I live here too, so the fact that you like to gamble should take into account the fact that I don't :)
As an engineer, surely you can appreciate that making a change, any change, is relatively easy, but making the correct change can be very difficult. In damaging the environment, we've moved the dials on a very complex machine, and we could do something else and move them again. Maybe we'll even get lucky and set them back to where we started, but of course getting them back to where we started probably won't fix the problem.
Lovelock has always been a radical, and I've never taken his Gaia theory seriously. I think he was quoted a few years ago as saying that nuclear energy was the only viable immediate solution, but now he seems to have changed his mind. It doesn't matter; what matters is making sound decisions based around the scientific analysis, ignoring the personalities and the near-religious fanaticism of some campaigners. In the final analysis, I think there is a real problem because (although I'm not a scientist) I can't see why so many people who are would lie so deliberately, so persistently, and about such a serious issue.