Great topic!! I have been trying to tell people for the past 20 years that there is no such thing as "global warming", or the implication that it is manmade rather. These damn global closet environmentalists(note that "mental" is what these people are) keep trying to make the case for it, yet anytime i ask one of them "what percentage of the warming is caused by mankind, and what percentage is natural occurance?" not one damned soul can give me an answer...any answer. They always come back with "does it really matter? it all hurts the environment" to which i reply yes it matters, because you are creating theory from an incomplete set of data. you must know how much greenhouse gasses are produced from all areas, not just man made. then i explain to them that on the earth at any given time there are usually at least 3 active volcanoes which are belching more greenhouse gasses into the atmosphere daily than all humanity combined puts into the atmosphere in a week. If you do not know what is occuring naturally how can you make the theory that mankind is to blame for increased tempuratures. that isn't even taking into account that the earth has a climate cycle of about 25k-32k years...we call it the ICE AGE, which is simply the low temp of the cycle, and now we are simply heading into the maximum of the range again... those idiots.