TREXLER CLIMATE AND Energy Services, Inc. (TC+ES) was founded as Trexler and Associates, Inc. (TAA) in the year 1991 by Dr. Mark C. Trexler, formerly of the World Resources Institute in Washington, D.C. TC+ES is based in Portland, Oregon. TC+ES was the company that wrote the first contracts for carbon offset, and designed the first methane carbon offset project for a coal mine.

Until 1997, the company was the only one serving the private sector in climate change mitigation services. That same year, TAA worked with Stony-field Farm and its New Hampshire facility, helping the company to become the United States' first “greenhouse gas (GHG) neutral” facility. In 2000, TAA assisted Shaklee Corporation in its application to the Climate Neutral Network for the pilot certification of ...