There are many on JREF who are genuinely concerned about AGW, and it's potential impact on our planet, and our lives.
I was interested in what people were actually doing about it.
The trouble with your poll and question is that it misses three very important points that most realists also make. Sure, global warming is happening and it's almost certainly at least partially our fault. However, that doesn't mean we can actually do anything about it. No matter what a few people, or even a few countries, do, everyone else will make sure that all that coal and oil gets burned. Even if that were not the case, we don't have a viable way to reduce the carbon we've already released. There's very little point trying to stop global warming. Even without any human influence, the climate will change, as deniers are often fond of pointing out. What we need to do is make sure we can cope with whatever happens, whether it is our fault or not.
The second point is pollution. Arguing about carbon and its long term effects is all very well, but there are many other forms of pollution which are easily demonstrated to be harmful and often have much easier solutions. Acid rain was a big worry for a while. Whole forests were dying, lakes becoming sterile and so on. Fortunately we saw the problem, found the cause and it is now much less of a problem. Same for the ozone layer. It's still not looking happy, but the holes aren't getting bigger any more, although there's still a way to go before they actually heal. Smog is one that's much more of a problem. The Beijing Olympics gave a bit more focus, but there are many places with similar problems that no-one hears about. Toxic waste and disposal appear in the news occasionally, but they are a problem all the time. Landfills, chemical spills, heavy metals, radioactive waste, mine leavings and so on. There are many, many different types of pollution and almost as many different sources. We shouldn't need global warming in order to realise just how dirty the human race is. Even if you don't believe global warming is happening at all, there are so many other reasons to try to reduce waste.
Finally, there's the problem of resources. Does burning coal and oil cause global warming? Who cares? It'll all be gone in a few years anyway. We don't need renewables and nuclear to give us clean energy, we need them to give us energy, full stop. It won't be a decade, it probably won't be a century, but non-renewables will run out, by definition. And it's not just fuel. There's a limited amount of virtually everything that human civilisation runs on. Plastics are mostly made from oil, which makes burning it really quite stupid. Metals could all be recycled, but the way we use them tends to scatter them around the place which males it impractical to do so. Which brings up the point that I've noticed a couple of people mention recycling. Recycling is bad for global warming, since it often takens more energy than simply making new stuff. However, what recycling does do is make our resources last longer and reduce waste. We could theoretically have unlimited clean energy just using current technology. What we can't have is unlimited material resources.
This is why I generally have problems with both sides of the global warming arguments (I wouldn't consider it any kind of actual debate). On the one hand you have the deniers who are perfectly happy to ignore reality and lie as much as possible just to support their ideology. On the other hand, you have people making a huge fuss about something which their proposed solutions won't do a damn thing about, and which is unlikely to cause us any real problems until well after we have plenty of more serious things to worry about. Climate change is real, and it can be coped with by working out what will probably happen and planning appropriately. The doomsayers who make it out to be a big bogeyman just to score political or environmental points are just as bad as those who deny it exists at all. Humanity has enough problems without having to pretend some are much bigger than they really are.
As for the actual question, I have electricity from windfarms (and my flat doesn't have gas or oil), I cycle to work and walk to the shops. I have energy saving lightbulbs, I hardly use heating (high metabolism or something), and I recycle all the stuff I can. In order to offset that, I work at a particle accelerator which requires the equivalent of a small power station to run.