The likely extent and impact of AGW and the most cost effective ways of mitigating it are almost certainly the most important and challenging topics that can and should be being discussed in the science forum of a board like this. If not here, then where? So it is of real concern to me that such a discussion appears to be impossible, on this or any other forum where I've seen such a discussion attempted.
I've come to the reluctant conclusion that the only solution to the problem is for every sincere poster to simply ignore the heckling, and respond only to reasonable questions and valid, supported points. I know how hard it is to leave ridiculous unsupported assertions unchallenged, none better, but when the result is weeks and pages of pointless argument about the definition of phrases whose meaning is self evident or the difference between well known and understood terms it is clear that such responses only serve the agenda of those who make them.
A recent post by JFrankA asked sensible questions which could form the initial basis of the discussion going forward.
This interesting experiment might also generate some on-topic debate. If we can demonstrate that it is possible to have an adult conversation about this subject the mods might eventually take the thread off moderated status, which I'm sure discourages many forum members with worthwhile contributions to make from posting.
I would also like to respectfully request that the mods create a Part 2 of this thread. Not only would that reduce the unnecessary load on the server I'm led to understand is caused by threads as large as this one, it might also help encourage new posters to join the discussion.