When it comes to 'denying' climate change, Big Oil has clearly been at the forefront - for obvious reasons:
Futures Forum: Climate change: is it Big Oil's greatest 'existential risk'?
Futures Forum: Climate change: "Just 90 companies are to blame"
Futures Forum: Overproduction and the end of Big Oil's business model
Futures Forum: Climate change: 'stranded assets' and 'unburnable oil' ...... or the pressures to leave oil and gas in the ground
We now know that Big Oil knew:
Futures Forum: Climate change: and 'taking statements out of context' >>> Climategate and Copenhagen >>> ExxonMobil and Paris
Exxon Knew about Climate Change Almost 40 Years Ago - Scientific American
What Exxon Knew About Climate Change - The New Yorker
ExxonMobil climate change controversy - Wikipedia
And perhaps we know now because the industry is getting a little more relaxed about the issue:
Futures Forum: Why is Big Oil now in favour of a carbon tax?
Another company has been 'outed':
Shell made a film about climate change in 1991 (then neglected to heed its own warning)
With thanks to:
Sustainable Crediton - Shell made a film about climate change in 1991