"Documents released during tobacco litigation demonstrate ... the crucial role that scientists played in sowing doubt about the links between smoking and health risks. ... The same strategy was applied not only to global warming, but to a laundry list of environmental and health concerns, including asbestos, secondhand smoke, acid rain, and the ozone hole."

“This message of scientific uncertainty has been reinforced by the public relations campaigns of certain corporations with a large stake in the issue. The most well known example is ExxonMobil, which in 2004 ran a highly visible advertising campaign on the op-ed page of the New York Times. Its carefully worded advertisements—written and formatted to look like newspaper columns and called op-ed pieces by ExxonMobil—suggested that climate science was far too uncertain to warrant action on it. One advertisement concluded that the uncertainties and complexities of climate and weather means that "there is an ongoing need to support scientific research to inform decisions and guide policies". Not many would argue with this commonsense conclusion. But our scientists have concluded that existing research warrants that decisions and policies be made today.”