Massachusetts Sierra Club is the state chapter of the largest, oldest, and most influential environmental grassroots organization in the country. With a small staff supporting volunteer leaders and over 100,000 members and supporters across the state, we are volunteer-driven with a mission: To explore, enjoy, and protect the planet; to practice and promote the responsible use of the earth's ecosystems and resources; to educate and enlist humanity to protect and restore the quality of the natural and human environment; and to use all lawful means to carry out those objectives.