As an American Association for the Advancement of Science Congressional Science Fellow, he worked on energy and forestry legislation and on legislation that eliminated American use of CFCs in spray cans to protect the ozone layer. Moomaw also founded the Tufts Climate Initiative and co-founded the Global Development and Environment Institute, and has served on the boards of The Climate Group, Clean Air-Cool Planet, Earthwatch Institute, Center for Ecological Technologies, Woods Hole Research Center, and the Consensus Building Institute. He remains an active advocate and commentator.
