House Democrats on Wednesday laid out evidence that the oil behemoth ExxonMobil had known since the 1970s about the potential for a climate crisis and intentionally sowed doubt about it. One of those testifying was Martin Hoffert, a scientist consultant for Exxon Research and Engineering in the 1980s. Responding to the New York congresswoman Alexandria Ocasio-Cortez, Hoffert testified that in 1982, Exxon scientists predicted how carbon dioxide levels would rise and heat the planet as humans burned more fossil fuels