In regard to the new poster's points (and welcome from me - )
I find it hard to believe that there is a global conspiracy between scientists from around the world, what purpose would this serve?
I will offer an analogy - that of Margaret Meade (the so-called anthropologist of the south sea islands of the 1920's). She taught a sort of pre-hippy "free love" amoral culture of the South Pacific islands as mankinds natural behavioral order. Modern society with its mores and rules were said to be artificial results of prissy religions. This was soundly debunked in the 1980's because it was discovered that she was just apeing her mentors and giving positive vent to her own personal lifestyle. She had barely visited the cultures in question - having spent most of her time in various "social" activities. Those who opposed her view, however, were taken to be krackpot nuts by the mainstream university professors, and were immediately supressed. She is still taught in most courses on this subject because she was famous and it has become the norm. The only two girls she is supposed to have interviewed on the island have long since renounced her accounts.
Like the JWs - the science community has from time to time just started saying and publishing things so long enough to make it into their current political wisdom and so that is what it becomes. They are then reluctant to rethink it. This serves the purpose of those who get money from giving the speeches, writing the books, and teaching these things long enough to get their tenure.
Ultimately, if it could possibly relate to our activities (which seems likely), and we won't enjoy the consequences, why take the risk that the people with the most information are wrong? ...better safe than sorry would seem to be a sensible approach, given that we don't have any spare planets to live on.
Can you imagine the "risk" we would take by instantly dismantling our electric power grid and current transportation systems worldwide (including rail, sea, air, as well as the highway vehicles)? Or by doubling our fossil fuel power production to run minimal electric cars? Or to try and replace it all with nuclear fission? How do you know that the third world developing countries would not just burn oil and coal to more than make up for those who made the sacrifice. Brazil is in fact, still a petroleum importer - they only make about twice as much fuel ethanol as we do - and have done great ecological harm to their native forests to grow that much sugar cane.
I submit that if poorly researched panic mode plans are taken, then we might prove to be more "sorry" than "safe".
Sincerely, James