Document QJdeR1GXygrb4XyRz33GGbeJ4

July 31,2017 The Honorable Scott Pruitt Administrator U.S. Environmental Protection Agency 1200 Pennsylvania Avenue, NW Washington, D.C. 20460 Dear Administrator Pruitt: As leaders of professional scientific societies with our collective membership of hundreds of thousands of scientists, we are writing in response to reports that you are working to develop a "red team/blue team" process that challenges climate science. We write to remind you of the ongoing research, testing, evaluations, and debates that happen on a regular basis in every scientific discipline. The peer review process itself is a constant means of scientists putting forth research results, getting challenged, and revising them based on evidence. Indeed, science is a multi-dimensional, competitive "red team/blue team" process whereby scientists and scientific teams are constantly challenging one another's findings for robustness. The current scientific understanding of climate change is based on decades of such work, along with overarching, carefully evaluated assessments within the United States and internationally. As a reflection of that work, 31 scientific societies last year released a letter, updated from 2009, to reflect the current scientific consensus on climate change. We urge you to give its text consideration, along with , the work of our premier United States scientific body, the . Of course, climate science, like all sciences, is an ever-changing discipline: our knowledge is always advancing. Robust discussion about data interpretation, methodology, and findings are part of daily scientific discourse. That is how science progresses. However, the integrity of the scientific process cannot thrive when policymakers--regardless of party affiliation--use policy disagreements as a pretext to challenge scientific conclusions. Given your interest in the state of climate science, we would welcome the opportunity to meet with you to better understand your perspective and rationale for the proposed activity; and to discuss climate science, including which areas are at the frontiers of scientific knowledge and which are well-established because of thousands of studies from multiple lines of evidence. 17cv1906 Sierra Club v. EPA ED_001523B_00005354-00001 We look forward to hearing from you, and your office may contact Lexi Shultz ), Kasey White (kwhite@geosociety.org), or Joanne Carney ) to coordinate a meeting. Sincerely, Rush D. Holt, Ph.D. Chief Executive Officer American Association for the Advancement of Science Robert Gropp, Ph.D. Co-Executive Director American Institute of Biological Sciences Chris McEntee Executive Director and CEO American Geophysical Union Ellen Bergfeld, Ph.D. Chief Executive Officer American Society of Agronomy Crop Science Society of America Soil Science Society of America 17cv1906 Sierra Club v. EPA ED_001523B_00005354-00002 Brian Crother, Ph.D. President Elect American Society of Ichthyologists and Herpetologists 7 Crispin B. Taylor, Ph.D. Chief Executive Officer American Society of Plant Biologists Barry D. Nussbaum, Ph.D. President American Statistical Association Olin E. Rhodes, Jr., Ph.D. President Association of Ecosystem Research Centers Linda Duguay, Ph.D. President Association for the Sciences of Limnology and Oceanography 17cv1906 Sierra Club v. EPA ED_001523B_00005354-00003 Robin L. Chazdon, Ph.D. Executive Director Association for Tropical Biology and Conservation Katherine S. McCarter Executive Director Ecological Society of America David Gammel Executive Director Entomological Society of America Vicki McConnell, Ph.D. Executive Director Geological Society of America Paul Foster, Ph.D. President Organization of Biological Field Stations 17cv1906 Sierra Club v. EPA ED_001523B_00005354-00004 Raymond Mejia President Society for Mathematical Biology Luke Harmon, Ph.D. President Society of Systematic Biologists 17cv1906 Sierra Club v. EPA ED_001523B_00005354-00005