An outdated stance on climate change has re-emerged, benefiting oil giants like Exxon and Shell. For over 60 years, these companies secretly financed studies and campaigns to downplay the dangers of fossil fuels, despite knowing the truth since 1957 through their own confidential research. By the 1960s, they were already preparing for a warming planet—building higher oil rigs and reinforcing pipelines in the Arctic—while publicly denying the problem. In the 1980s, Exxon abruptly halted its climate research and began funding counter-studies and misinformation campaigns, casting doubt on climate science. Today, prosecutors and counties across the U.S. are investigating Exxon and other oil companies for deliberately misleading the public. This is a story of a decades-long cover-up, only now being revealed.