25 1981—Internal Exxon Correspondence from May 1981 acknowledges rising CO2 levels, likely global temperature increases, and potentially significant impacts, but proposes that Exxon’s public position be that action is not yet needed because the problem won’t be detectable until the year 2000. In an internal Exxon memo communicating Exxon’s public position on climate change and also providing relevant background, Exxon scientist Henry Shaw expressly acknowledged that atmospheric CO2 had increased to 338 ppm since 1957 and would reach 380 ppm by the year 2000. (Annex D hereto.) He recognized that a doubling of CO2 would raise global temperatures by 3 degrees Celsius and 10 degrees at the poles, resulting in major shifts in rainfall patterns and agriculture and the melting of polar ice. (Fig.7.) Fig. 7. Nonetheless he communicated that Exxon’s public position on the matter was that it was too early to take action on climate change and that potential concerns about climate change should not slow the growth of carbon intensive synthetic fuels, including shale oil. (Fig. 8) Fig. 8.