Don't take this the wrong way, but I think you might not have considered some of the impact of the rising temperatures. Since you seem like you're being fairly open-minded about this, and since I agree with some of your conclusions (particularly about technology), I don't mind pointing this out. In a lot of places a few more degrees would be nice. Unfortunately, humans tend to like water. They settle on rivers, floodplains, and low-lying coastal areas. Even more unfortunately, these also tend to be high-density, low-income regions. For instance, the nation of Bangladesh, which has 140 million people generally living in poverty is mostly <10m above sea level. (http://countrystudies.us/bangladesh/23.htm). Worse, the entire coastal area is essentially at sea level. A small increase in temperature would cause a small increase in sea levels, which would immediately displace millions of indigent people. Of course, this is only one small country. While not every country will have nearly the same scale of problems, it's clear that the human toll in some areas at least could be severe.
The environmental impact on wildlife is also actually rather interesting. I don't have any links or handy info available, but there have been a number of fascinating studies done on how life is adjusting or not adjusting to these issues. The warming that's happened so far has illuminated some interesting things that we might not have discovered otherwise. We stand to lose a great deal of biodiversity, however, at least in the short term (geologically speaking of course).
So, not all change is bad, man-made change can sometimes be really good...but I don't think that's the case on balance here. YMMV, though. Did you have anything concrete that you'd like to point out to support what you were saying? I would be interested to hear it (and not just as a rhetorical point, either).
