Global warming is most certainly not a scam. It is not even the greatest threat, but rather a minute detail leading to a much more drastic occurrence - climate shift. Global warming is far from 'new'. The terminology certainly is, but not the process in which it names.
The argument comes into play with regards to exactly what effect are we, as humans, having on such a change. Living in an antropocentric society, we all certainly seem to blame "man." In my opinion, this is not the case, but rather an entirely, and prevelant, natural effect. Global warming did not start with the Industrial Revolution, but rather roughly 18,000 years ago, bringing a hault to a 100,000-year ice age. This is a recurring and natural process. Climates shifts within the span of 15-20,000 years and as evident, we are in that transitional period.
The effect that follows is an ice age. Not going to introduce the physiology behind the matter in an attempt NOT to lose readers. Science is a very interesting field but its technical terms often shuts the doors to many.
However, "global warming," as it has adequately been named, is for all intents and purposes a politically driven idea. While we are, in effect, aiding the increase of Carbon Dioxide emisions, it is still a natural force that is driving the climatic change. Our influence is, in fact, minuscule. We account for less than 5% of the greenhouse effect, while natural water vapor is responsible for 95% of the heat that is entrapped.
At this current point in time, the matter is debatable. There is currently no proof, with regards to "sound science", that the burning of fossil fuels is effecting the warming of the planet. While I most certainly do believe this could be so, there is no evidence.
But this should not be turned into a "he said, she said. he did, she did" battle. The danger is evident and inevitable. We, as humans, should take steps to prepare and devise ideas to withstand such a change in our climate. Geological evidence certainly proves the sporatic and dynamic changing of our climate. Arguing whether or not it is real is preposterous. Our climate changes, it is natural. Either way, we would be subjected to those changings.
Just my two cents which you already have ;p