Here are five of the best:
Caplan Communications
One of the largest U.S. firms to specialize in Environmental Advocacy, Caplan Communications drives some of the biggest environmental campaigns to date. The latest National Geographic campaign created by the company is “Cool It.”. This coincides with a release of a special single issue of the magazine dedicated to Climate Change. Other clients include green activists like Alaska Wilderness League, American Lung Association, American Rivers, Chesapeake Bay Foundation, Defenders of Wildlife, Earthjustice, Environmental Defense Fund, Environmental Entrepreneurs, Evangelical Environmental Network, Friends of the Earth, and Greenpeace USA. O'Dwyer's PR Report honored Caplan with the publication's first "O'Dwyer's Award for Public Communications Excellence" in the environmental/public affairs category. O'Dwyer praised the company for orchestrating a campaign which effectively prevented the Environment Protection Agency from relaxing safeguards, prohibiting the dumping of largely untreated sewage into America's rivers, streams and lakes
Cerrell
An L.A. based firm, Cerrell runs one of the largest and most integrated Environmental Energy departments in PR. The firm’s expertise in the field cover Coalition Building and Alliance Development, Technical Communication, and Community Outreach. Part of the company’s strength comes from the fact that as a California based firm, it gets the opportunity to work with both National and local California campaigns. The latest case studies for Environmental Energy conducted by the firm include Los Angeles Stormwater Quality Partnership, and Shell Hydrogen.
Antenna
Antenna is a San Francisco PR firm specializing in Energy Technology, High Technology, Life Science, and Corporate Responsibility. Antenna’s specialty Energy Technology stresses a common sense approach to the reduction of greenhouse gasses, while rethinking solar energy. Antenna also recognizes real-world needs for businesses to grow, and ensures that innovation is not at the expense of the environment. The company is owned by Beckerman PR in New Jersey.
Makovsky PR & Integrated Communications
Makovsky PR communications experts have a track record of helping a broad spectrum of clients in the field of energy and sustainability to communicate their value to key audiences. The U.S. Department of Energy's former head of public affairs leads the firm, as well as a staff which has years of experience working with companies on environmental concerns.





