Oil Company Exxon Knew About The Scientific Reality Of Climate Change In 1981

http://thinkprogress.org/climate/2015/07/10/3678684/original-sin-denial-exxon-climate-change-1981/
"the Global Climate Coalition (GCC), an anti-action lobbying group backed by fossil fuel industries, ignored its own climate scientists during the 1990s while spreading disinformation about global warming. An internal report stating that the human causes of global warming “cannot be denied” was ignored by GCC leaders."