As far as I'm concerned, the jury's still out on the global warming thing. Those "pushing" it (many of whom were saying thirty years ago that we were headed for an ice age) have been at it for quite some time. While the research that doesn't support it is just beginning to emerge, not having had as long to work on it.
I figure it'll be a while before we can say with any certainty which side is bunk, and I'd rather not do anything that will cripple our civilization (also a shamelessly anthropocentric perspective, I know) until we're sure which way we should jump.
At the same time I don't see any reason we shouldn't do the things that are less burdensome — it's just good stewardship of the planet. I've got a garage full of cardboard (moving boxes) that I'm having to cut up and parcel so that I can fit it into my car to get it to the recycling place (which doesn't want to pick it up and only operates about 5 hours a day). It'd be easier to just trash it, but the stuff is 100% recyclable, and I'd rather spend the sweat than waste it.