Personally I am sitting on the fence re global warming. I do all the “green” things because I think it’s good to limit pollution and Glob Warm may be true. However when I read or hear pundits banging on about Glob Warm a few questions occur to me which never seem to get mentioned let alone answered.
Questions like: How long has this warming been going on and how does it compare with how long humanity have been industrialised? What percentage of CO2 is generated by humanity compared with natural emissions? How much CO2 does a random volcanic eruption produce?
This site addresses these questions and many others.
http://www.geocraft.com/WVFossils/ice_ages.html

It’s basic thesis is that the Earth cycles between ice ages and “interglacials” and at the moment we are at the beginning of an interglacial which is why the climate is warming up.
After 20,000 or so another ice age will come along whether we drive big cars or not.
One problem with this idea is that it presents a different narrative for the future of humanity from that in the popular imagination. The present Western view of the future of humanity is something along the lines of Star Trek. Western values will sweep the globe, we’ll become united, we’ll develop technology and in thousands of years time we’ll all but nipping around the universe in space ships but returning to Earth to for our holidays.
This doesn’t sit well with civilisation being wipes out by an ice age.
Here are some excerpts from the site:
“Global warming started long before the “Industrial Revolution” and the invention of the internal combustion engine. Global warming began 18,000 years ago as the earth started warming its way out of the Pleistocene Ice Age– a time when much of North America, Europe, and Asia lay buried beneath great sheets of glacial ice.”
“Approximately every 100,000 years Earth’s climate warms up temporarily. These warm periods, called interglacial periods, appear to last approximately 15,000 to 20,000 years before regressing back to a cold ice age climate. At year 18,000 and counting our current interglacial vacation from the Ice Age is much nearer its end than its beginning.”
“At 368 parts per million CO2 is a minor constituent of earth’s atmosphere– less than 4/100ths of 1% of all gases present. Compared to former geologic times, earth’s current atmosphere is CO2- impoverished.”
“Beginning about 18,000 years ago the Earth started warming up, halting at least temporarily a 100,000-year-long Ice Age, during which the upper latitudes of almost all the continents lay buried under thick sheets of glacial ice.”
It also points out that many of the “scientists” who signed petitions to do something about glob warm know bugger all about climate.
If you’re passionate about global warming then be prepared to get angry.