Number One, following in the footsteps of the tobacco industry and the intelligent design folks is to contend that a serious debate still exists among the world's experts as to the reality and the cause of global warming. They have also sought out and funded scientists who tend to find results favoring their interests to the extent of actually producing "counterfeit science". They have created front organizations claiming to be researching the issue that actually do nothing but advocate for the fossil fuel agenda. Lately, of course, they have been pretending to be 'greening' themselves - making the transition to renewable energy technologies while they actually plan and invest in nothing but continued fossil fuel production. And last summer they got my dog pregnant.
Big oil has funded emissions reduction research for over 40 years.