California's Four Critical Ecoregions

The Sierra Club's Critical Ecoregions Program offers a practical, long-term strategy to buttress the "web of life" on Earth.  Region by region, we've developed multifaceted plans for every major land and water system in the United States and Canada, home to most of the Sierra Club's 700,000 members.  Tailored to the particular needs of each ecosystem, these 21 regional plans help achieve our global vision -- to restore the ecological health of the planet -- through concrete local action.

California's Four Critical Ecoregions