A citizens environmental group born out of the 1992 Earth Summit in Rio de Janeiro, Equiterre was originally named ASEED (Action for Solidarity, Equity, Environment, and Development), and after getting non-profit status in 1995, changed its name to Equiterre. The work Equiterre undertakes covers a wide range of projects from climate change, to energy to fair trade.

"For the past two decades, Steven has worked tirelessly for the environment. Over the years, his unparalleled skills as a communicator have allowed both Greenpeace and Équiterre to advance files of great importance in Québec, Canada and internationally. In particular, I'm thinking of Canada's ratification of the Kyoto Protocol and the Québec government's adoption of the most ambitious greenhouse gas reduction targets in all of North America," said Sidney Ribaux, executive director of Équiterre. Mr. Ribaux added, "This is an honour that Steven truly deserves and, on behalf of the entire Équiterre team, I'd like to congratulate him!"

Guilbeault is also a long time member of the boards for Climate Action Network (CAN) Canada and CAN International.