Environmental Update Main Alaska Rainforest American Southeast Arctic Atlantic Coast Boreal Forest Central Appalachia Colorado Plateau Great Basin Great Lakes Hawai'i Hudson/James Bay Interior Highlands Mississippi Basin North American Prairie Northern Forest Pacific Coast Pacific Northwest Rocky Mountains Sierra Nevada Southern Appalachia Southwest Deserts Environmental news, green living tips, and ways to take action: Subscribe to the Sierra Club Insider!

The Critical Ecoregions Program offers a practical, long-term strategy to buttress the "web of life" on Earth. Region by region, the Sierra Club is developing multifaceted plans for every major land and water system in the United States and Canada, home to most of the Sierra Club's 600,000 members. Tailored to the particular needs of each ecosystem, these 21 regional plans will help achieve our global vision: to restore the ecological health of the planet through concrete local action. Clickable Map of 21 Critical Ecoregions Introduction Program Strategy Up to Top