On August 31, 1988, George H. W. Bush gave a progressive campaign speech on the environment, touching on many issues present still. After becoming the 41st President he appointed the first environmentalist, William Reilly ( https://en.wikipedia.org/wiki/William_K._Reilly ), to head the EPA.
Environmental policy of the United States https://en.wikipedia.org/wiki/Environmental_policy_of_the_United_States#The_George_H._W._Bush_Administration_.281989.E2.80.931993.29
Reagan, Bush 41 memos reveal sharp contrast with today’s GOP on climate and the environment https://www.washingtonpost.com/news/energy-environment/wp/2015/12/03/reagan-bush-41-memos-reveal-how-republicans-used-to-think-about-climate-change-and-the-environment
George H. W. Bush 1990 Georgetown University – We all know that human activities are changing the atmosphere in unexpected and in unprecedented ways. https://www.c-span.org/video/?11033-1/presidential-address