In a 2002 memo to President George W. Bush titled "The Environment: A Cleaner, Safer, Healthier America", obtained by the Environmental Working Group, Luntz wrote: "The scientific debate is closing us ... but not yet closed. There is still a window of opportunity to challenge the science. ... Voters believe that there is no consensus about global warming within the scientific community. Should the public come to believe that the scientific issues are settled, their views about global warming will change accordingly. Therefore, you need to continue to make the lack of scientific certainty a primary issue in the debate, and defer to scientists and other experts in the field."