Scientists asked to advise an industry group about greenhouse gases and global warming were ignored by the industry during the 1990s. The Global Climate Coalition represented oil, coal and auto industries. Its own scientists wrote in a 1995 internal report that the human contribution for the greenhouse effect could not be denied, yet the coalition continued to run multi-million dollar ad campaigns and lobbying efforts essentially designed to create enough public and political confusion so as to sow doubt. Since then, even many companies like Exxon Mobil have recognized a human contribution to the present warming trend.
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