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Yes, this is a very politicized issue, and we can largely blame the enviro-wackos for that. Nevertheless, lots of conservatives have painted themselves into a corner by insisting that there is no global warming at all.
Global warming will not be all bad, but it will change our world. For example, it is possible that the fabled "Northwest Passage" thru the Artic Sea may be open for year-around traffic within 10-20 years. If this happens, it will definitely change world trade patterns - North Asia (Japan, Korea, China) will have a new shortcut to the markets in West Europe, and vice versa. This will probably be a boon for Asia. For the US, the implications are much less clear.