ExxonMobil's private research predicted how burning fossil fuels would warm the planet but the company publicly denied the link, they suggest."It really underscores the stark hypocrisy of ExxonMobil leadership, who knew that their own scientists were doing this very high quality modelling work and had access to that privileged information while telling the rest of us that climate models were bunk," Naomi Oreskes, professor of the history of science at Harvard University, told BBC News."Our analysis allows us for the first time to actually put a number on what Exxon knew, which is that the burning of their fossil fuel products was going to heat the planet by about 0.2C of warming every decade," he said.Prof Oreskes said the findings show that ExxonMobil "knowingly misled" the public and governments.Prof Oreskes and Prof Supran carried out the research after journalists in 2015 uncovered evidence suggesting ExxonMobil's knew about climate change, but were accused by ExxonMobil of "cherry-picking" the truth."