400+ scientists to Hill+Knowlton: Drop Fossil Fuels, Make COP27 a Success

Over 400 scientists have called on Hill+Knowlton Strategies and its parent company WPP plc to drop fossil fuel clients, arguing that representing companies like Saudi Aramco and ExxonMobil is incompatible with the agency's role in leading public communications for the COP27 UN climate talks. The signatories claim the agency has enabled disinformation campaigns and that its clients' plans to increase production contradict the goals of the UNFCCC.

• Over 400 scientists argue that Hill+Knowlton has supported disinformation campaigns by working for clients including ExxonMobil, Saudi Aramco, and the Oil and Gas Climate Initiative.
• The signatories assert that the business strategies of Hill+Knowlton's fossil fuel clients, which aim to expand production, are in direct opposition to the objectives of the UN Framework Convention on Climate Change (UNFCCC).
• The scientists claim that Hill+Knowlton's representation of the fossil fuel industry compromises its credibility and legitimacy as the lead for public communications at the 2022 UN climate talks (COP27).
• The document demands that Hill+Knowlton end its professional ties with fossil fuel clients that contribute to the climate crisis and commit to climate action.

APA

Caldas, A., Canadell, P., Cleetus, R., Oreskes, N., Supran, G., Yohe, G., Abel, B., Abrams, P., Alexander, P., Alic, M., Allison, S., Ames, L., Anderson, V., Ardeshir, F., Azeez, P., Bachhuber, S., Baker, N., Bakken, G., Balsai, M., ... Zwicker, J. (n.d.). 400+ scientists to Hill+Knowlton: Drop Fossil Fuels, Make COP27 a Success. Clean Creatives. https://cleancreatives.org/hkletter

Chicago

Caldas, Astrid, Pep Canadell, Rachel Cleetus, Naomi Oreskes, Geoffrey Supran, Gary Yohe, Bonnie Abel, et al. 400+ scientists to Hill+Knowlton: Drop Fossil Fuels, Make COP27 a Success. Clean Creatives, n.d. https://cleancreatives.org/hkletter.

Wikipedia

{{cite press release |last1=Caldas |first1=Astrid |last2=Canadell |first2=Pep |last3=Cleetus |first3=Rachel |last4=Oreskes |first4=Naomi |last5=Supran |first5=Geoffrey |last6=Yohe |first6=Gary |last7=Abel |first7=Bonnie |last8=Abrams |first8=Peter |last9=Alexander |first9=Peter |display-authors=etal |title=400+ scientists to Hill+Knowlton: Drop Fossil Fuels, Make COP27 a Success |publisher=Clean Creatives |url=https://cleancreatives.org/hkletter |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@misc{caldasnd400, author = {Caldas, Astrid and Canadell, Pep and Cleetus, Rachel and Oreskes, Naomi and Supran, Geoffrey and Yohe, Gary and Abel, Bonnie and Abrams, Peter and Alexander, Peter and Alic, Margaret and Allison, Stuart and Ames, Lynda and Anderson, Virginia and Ardeshir, Feroza and Azeez, PA and Bachhuber, Stephen and Baker, Norman and Bakken, George and Balsai, Michael and Barland, Peter and Jr., Oron Bass, and Bauza, William G and Bazerman, Charles and Becker, Jennifer and Becket, Nola and Belau, Peter and Bellus, Stephen and Bench, Robert and Benham, Elyce M. and Bergman, Garrett and Bergman, Michael and Berkson, Joseph and Bernstein, Julie and Bertram, Miriam and Betts, Alan and Black, Jason and Blick, Jonathan and Bloyer, Robert and Boker, Wanda and Bolin, Clarence and Boone, Jim and Bosque, Vivian and Boudart, Jan and Bourgoin, Kathryn and Bovenkerk, Janet and Boyle, Alaina and Braoudakis, Spyros and Brill, Keith and Brown, Kevin and Brown, John R. and Bryce, Barbara and Budd, Joan and Buist, Alison and Burger, Theodore and Burns, Hannah and Burstrom, Ruth and Bylsma, Tara and Byrne, Jim and Campbell, John and Camphire, Christian and Carson, Bobb and Caton, Elaine and Cheney, Kristen and Chinn, Jeanne and Jr., Pete Clapham, and Clark, Stephanie and Cless, Downing and Clifford, Ruth and Codur, Anne-Marie and Cohen, Charles and Cohen, Anne and Cohen, Rajal and Conant, Douglas and Cooper, Jim and Cornely, John and Craft, David L. and Crawford, Morgan and Crozier, Don and Cutts, William and Dahl, Kristina A. and Daly, Barry and Davis, Gary and Davis, Curtis and Deaver, Mason and DeLyria, Elizabeth and Derzon, Jim and DeVine, Kelly and Diaz, Susan and Dickinson, Michael and Diouri, Mohammed and Dorsey, Ann and Dravis, Jeffrey and Dunn, Jessica and Egan, Peter and Ehrhardt, Erica and Ekwurzel, Brenda and Ellison, Mike and Enbar, Nadav and Entin, Eileen and Evelyn, Joseph and Falvo, Cathey E. and Fancher, James R. and Farrington, John and Feldman, Ryszard and Felton, John and Fiadeiro, Manuel and Fischer, Quentin and Flint, Stephan and Follman, Mike and Foreman, Mike and Forster, Michael and Forté, Chanese and Foschi, Patricia and Frost, Tom and Frumhoff, Peter and Garcelon, Marc and García, Paula and Garcia-Romeu, Albert and Garey, Jenene G. and Gary, Steven and Garza, Alvaro and Gasparovic, Charles and Gegenheimer, Peter and Georgette, Madelaine and Ghatge, Suhas and Glennemeier, Karen and Gluskin, Rebecca and Golding, William and Goldsborough, Bill and Goodman, Beverly and Goodman, Ron and Gould, Anita and Grace, Lise and Graves, Royal and Greef, Fred and Greenberg, Jay and Greenfield, David and Grego, Laura and Grether, Greg and Griffin, Georgia and Groth-Marnat, Gary and Gurdin, J. Barry and Hale, Susanne and Hall, Bobbi and Halpern, Charles and Hamilton, Stephen and Hamlin, Robin and Hanson, Ryan and Hardy, John and Harlow, Patricia and Harris, David and Harris, Donna and Hauck, Molly and Hawthorne, Catherine and Heaney, Michael and Hecox-Lea, Bette and Hector-Smith, Beverly and Herr, Valerie and Herszenson, Sidney and Hill, Jonathan and Hinds, Ward and Hlodnicki, Bruce and Hoang, Lynn and Hoffer, William and Holder, Elisabeth and Holdstock, Richard and II, John Hoover and Horne, William and Houdashelt, Mark and Houston, Samantha and Hubbard, Edward and Hughes, Lisa and Hull, Cynthia and Hunt, Stephen and Jackson, Richard and Jacobs, Nicole and Jacobs, Trudy and Jacques, Karen and Jensen, Christopher J. and Jerome, Maryanne and Jimenez, Jose-Luis and Jones, Andrew and Jones, Virginia and Jones, James and Joos, Sandra and Jorgensen, Julia and Rajkarnikar, Pratistha Joshi and Judge, Susan and Kabat, Tom and Kahn, Henry and Karpick, Ronald and Katzin, William and Keel, Thomas and Keeland, Bobby and Keeney, Diane and Kegler, Lori and Kelley, Don and Kennedy, Sara and Kerlick, David and Kessler, Harrie and Ketchel, Steven and Kirpes, Martha and Klein, Renee and Klein, Phil and Klick, James and Knight, Ned and Knuepfer, Peter and Kohl, Steve and Kohlmann, R. Wade and Kolstoe, John and Krawisz, Bruce and Kreilick, Johanna Chao and Lang, Robert and Langstaff, Don and LaVal, Richard and Lavee, Allen and Lawrence, Vinnedge and Lawrence, Richard and Lebegue, Breck and Lederman, Kenneth and Lees, Dennis and Lehmann, Charlotte and Lemmon, Marilyn and LeVon, Peter and Lewis, Emanuel and Licker, Rachel and Liedlich, David and Lindell, Ashley and Link-New, Virgene and Lohrmann, David and Lorch, Frank and Lorraine, Hilary and Lucas, Rosa and Stein, Diana and Stein, Richard and Steiner, Rick and Stephens, Leigh and Stephenson, Roger and Stern, Dianna Paviso and Stewart, Philip and Stewart, Sarah and Strimbu, MJ and Stuebing, Edward and Susman, Kathleen and Sweeney, Dennis and Takaro, Tim and Teasley, Regi and II, Ray Telfair and Temes, Alan and Thomas, David and Tjepkema, John and Trail, Pepper and Tse, Keith and Urbano, Audrey and Valente, Tom and Vargo, Elisabeth Julie and Vayssieres, Marc and Venkataraman, Yaamini and Venters, Charmaine and Via, Sara and Vickery, John and Visser, Jan and von Rueden, Richard and Wagner, Gretchen Blu and Wakeman, John and Walker, Greg and Wallace, Steven and Walworth, Edward and Wang, Deane and Wang, Allan and Ward, Ronald and Ward, Sheila and Washienko, Kathleen and Webber, Fran and Weeden, Mary and Weiss, David and Welsko, Alexandra and Wenzel, Christopher and Werbach, Mel and Whelehan, Patricia and White, Katherine and Whiteley, Walter and Wilbur, Lynn and Williams, James and Willis, Paul and Wilson, Monte and Wilson, Sam and Wineman, Marian and Wolfe, Charles and Worms, Patrick and Wright, Don and Wu, Victoria and Wyatt, Tristram and Wynne, Judson and Xiuhtecutli, Nezahualcoyotl and Yeh, Emily and Yogev, Yonit and Yuster, Elizabeth and Zimdars, Eric and Zingg, Barbara and Zwicker, Judith}, title = {{400+ scientists to Hill+Knowlton: Drop Fossil Fuels, Make COP27 a Success}}, publisher = {Clean Creatives}, url = {https://cleancreatives.org/hkletter}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }