This would seem unfair, even if the thread wasn't a moderated one.
Normally if a thread isn't popular it is off the front page before you know it, never to be seen again. I don't see a problem with that.
So, anything that is not "very different" from a general global warming topic cannot be discussed outside of a single thread that is inherently linear. That could get confusing, and possibly overwhelming.
Then again, this sure would have been a good idea with the Ron Paul threads in politics a couple of years ago