Not only is global warming real (and you don't have to "believe" in it any more than you have to "believe" in that table), but the poor are *expected* to bear the brunt of the harm! So, yes, we should direct our economic resources towards improving the lot of our fellow people, *and*, as part of that, we should reduce our consumption of fossil fuels. If we need to burn fossil fuels to control HIV or Malaria, you do it. Hell, if fossil fuel fertilizer helped to make third world agriculture viable, that would be a worthwhile trade: although, actually, it tends to have the opposite effect.
Second, it it not true that it is "too late to do anything about it." This is part of the planned FUD from the fossil fuel lobby:
Stage 1) There isn't enough evidence to be 95% sure we've done anything to the environment,
and
Stage 2) Now that enough evidence has accumulated, it's because we've already changed the environment, so no point in doing anything about it.
This has been the plan of the oil industry all along, and they've been happy to tell people about it! But apparently, the need for "balance" in the media is so great, that you have to give equal time to someone even if they just sent a position paper out to their stockholders explaining that they were about to go on television and lie.
Regardless of what anyone "believes", the facts are actually quite straightforward: there is a great deal of uncertainty, but we can be >95% certain that human activity has raised the temperature of the earth somewhere between 1 and 10 degrees C, over the next century or so.
It's possible that the earth was getting warmer anyway - in which case any human contribution would probably be smaller, but would have a higher impact since going from +0 to +2 degrees doesn't make much difference but going from +4 to +5 *does*.
On to my other point - the "Stage 2 argument" is complete and utter bollocks. Yeah, we've had some impact - this doesn't mean that we can't do anything to mitigate further impact! Oh, look, I've spilled coffee on my couch. Well, now that my house is dirty, I might as well shit all over the floor and set my curtains on fire, because it makes no difference, now that the house is dirty anyway.