"The current global warming trend is caused by human activity, primarily the use of fossil fuels. That is an absolute fact. It's about as well established as Newtonian physics at this point."
This is precisely what is being debated. Simply stating in a /. post that it is certain does not make it so. It is precisely this certainty which, which questioned by scientists, is apparently leading to death threats and the like.
(1) There is debate as to whether or not the "current global warming trend", as you put it, even exists. You might not like that, you might even hate it and threaten people who say it (who knows...), but *there is debate*. There are many scientists who question that there is a warming trend at all, if the trend will continue, and if the trend is caused by any human activity. Variations in studies of the global temperature have shown conflicting results.
(2) If we assume that there is a trend of steadily increasing temperatures on the planet, it is still uncertain if this is caused by human activity or is an indication of natural processes at work in extremely long and hard-to-predict (let alone measure) geological cycles.
Please do not claim things which are not true, just by stating them with a lot of conviction and assuming others will not question them. It is exactly this practice which is hurting the global warming cause with reputable and skeptical scientists.
Come to think of it, ignore that request.
Do this as often as possible! It will bring about the revolution of thinking and increase the level of scientific skepticism of global warming theory all that must faster. Continue, by all means!