Exxon  continues to attempt to silence discovery that it knew by the late 70s that the fossil fuel industries were causing pollution that would eventually create catastrophic weather events and human extinction
http://insideclimatenews.org/news/16062016/exxon-sues-massachusetts-attorney-general-climate-change-fraud-investigation
 here again is one of there memos from 1981, obtained through the Freedom of Information act last fall