Is global warming a truth or hoax???

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Hi guys,With all the ruckus and pressure put forth by the media about the global warming some are afraid abt the global climate but many have reasons to believe that global warming does exists but not the extent that the media presents it.Its just another gimmick by the environmentalists and scientists to make millions on research.In the early 70's they had something like global cooling which become a big issue and now the whole attention is shifted to Global Warming!!!!If u guys have any comments why dont you write them???