Gagnon is also known for his work on botannical garden and nature themes. He also has an extensive portfolio of wildlife. Gagnon is a member of the Nature Conservancy as well as Defenders of Wildlife. His commitment to the environment is reflected in his pieces Mother Nature collage, Florida Wildlife collage, American Orchid Society collage, and Tribute to Georgia O'Keeffe collage. Marc Gagnon believes that the diversity of his work expands his artistry to all dimensions.