Shell and Exxon's secret 1980s climate change warnings   https://www.theguardian.com/environment/climate-consensus-97-per-cent/2018/sep/19/shell-and-exxons-secret-1980s-climate-change-warnings Benjamin Franta  19 Sep 2018

Newly found documents from the 1980s show that fossil fuel companies privately predicted the global damage that would be caused by their products.

In 1982, for example, Exxon predicted that by about 2060, CO2 levels would reach around 560 parts per million – double the preindustrial level – and that this would push the planet’s average temperatures up by about 2°C over then-current levels

in 1988, an internal report by Shell projected similar effects but also found that CO2 could double even earlier, by 2030. Shell’s assessment foresaw a one-meter sea-level rise, and noted that warming could also fuel disintegration of the West Antarctic Ice Sheet, resulting in a worldwide rise in sea level of “five to six meters.”

Also see: https://www.theguardian.com/environment/series/climate-consensus-the-97-percent