ExxonMobil scientists had accurately predicted global warming due to human-induced emissions since the 1970s even as the oil giant lobbied and launched campaigns to delay climate action, according to a new study. For decades, several fossil fuel companies have tried to convince people that a causal link between fossil fuel use and global warming cannot be made, arguing that the climate models used to project Earth’s temperature changes are uncertain. The new research, published in the journal Science on Friday, conducted the first ever systematic assessment of the fossil fuel industry’s internal climate projections. Scientists, including those from Harvard University and the Potsdam Institute for Climate Impact Research in the US, assessed the accuracy of global warming projections reported by Exxon and ExxonMobil Corp scientists between 1977 and 2003, based on never-before reported data buried in the Oil Giant’s internal documents. The findings suggest that what oil companies understood about climate models internally contradicted what they led the public to believe.

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