Oil company Shell has joined Exxon-Mobil as one of the big oil giants that knew about the dangers of global warming decades ago, and, like Exxon, subsequently worked to bury the issue. An educational video produced by Shell in 1991, titled Climate of Concern, has resurfaced courtesy of the Dutch climate news website, The Correspondent, that comprehensively outlines the human impact on global warming, the dangers the phenomenon poses, and potential solutions to the problem.read more