Fossil fuel companies are amongst the biggest and most profitable companies in the world, so they could easily have funded scientific studies, if It was real evidenced that contradicted the scientific consensus on manmade global warming.
Instead for example 80 percent of the Exxon’s research and internal communications acknowledged that climate change was real and was caused by humans, between 1977 to 2014. While 80 percent of Exxon’s statements to the broader public, which a lot bigger reach expressed doubt about climate change during the same period.
https://www.nytimes.com/2017/08/23/climate/exxon-global-warming-science-study.html
That the fossil fuel companies’ deceptive tactics have lead to today situation their people that deny the need for action against climate change still have a lot of influence. Think for example of Trump and also Scott Pruitt, the new head of EPA. While at the same time those people can’t even agree on if the climate is getting hotter or colder.