This kind of messages does not help your cause.
1) Stop insulting people. Maybe it is that the arguments where not convincing enough, or simply wrong.
You are certainly wrong about that. Insults DO help their cause.
Up until 1998 (which is still the warmest year on record), the alarmists actually supported their views with data (even though the famous "hockeystick" was manipulated and distorted it was at least indirectly connected to real data). But since about 2000, the data is ignored (For example, this outdated nonsense is still on the Wikipedia "Global Warming" page: http://en.wikipedia.org/wiki/F... and in the main article (http://en.wikipedia.org/wiki/Global_warming) right beside it is the sentence: "The Earth's average surface temperature rose by 0.74±0.18 C over the period 1906–2005" - hey, 2005 is already 9 years ago - what gives?) and the alarmists have stopped posting data and instead run almost completely on insults.
And yes, it does work. Nobody wants to be insulted.
On the other hand, of course the whole "climate science" needs alarmism as a reason for existence. They can't forecast "the climate will change slightly as it did numerous times before" - such a paper is boring, uninteresting and unlikely to get much interest for further funding. Also, successful climate scientists who pull the party-line can pump out paper after paper, literally swamping some dissident who writes a critical paper on his own time and dime.
So you have the carrot (grant money, good quasi-tenured jobs) and the stick (insults, social stigma). It is no wonder that you get >90% of approval that way, especially if you count papers (which can and are mass-produced).
But time is working against the alarmists. Every year that passes which is cooler than 1998 is yet another year they cannot explain. If we are living in an era of perpetually rising temperatures, one might think that the 1998 record should be broken by now.