One of the most interesting global questions today is whether the climate is changing and, if it really is, whether the reasons are man-made (anthropogenic) or natural - or maybe even both. The United Nations appointed Intergovernmental Panel on Climate Change (IPCC) has on several occasions warned that the climate is rapidly warming and that the reason for this is mostly the increased amount of carbon dioxide (CO2) in the atmosphere. This is an example of an "anthropogenic" effect. Former US Vice President Al Gore is known for advocating his "inconvenient truth" about the changing climate and forthcoming catastrophes and that the "science is settled". But the question still remains: is this so called greenhouse effect by the CO2 gas really of importance? How big is the effect on global warming? What other factors (or "forcings") are involved? Can we trust the IPCC and Al Gore? IPCC talks about a "science consensus" that the CO2 is to blame. But is this really true? Some say "No". There is an increasing group of "climate sceptics" comprising various professionals, non-professionals, scientists, economists, etc., who ask questions and do not accept that scientific issues can be solved by a consensus vote.
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