Which of the following groups addresses conservation in California specifically?

The Sierra Club is specifically focused on conservation efforts in California and is one of the oldest and most influential environmental organizations in the United States. Founded in 1892, it has played a significant role in advocating for environmental policies, protecting natural areas, and promoting sustainable practices within the state. Their initiatives often concentrate on local conservation issues, including protecting wilderness areas, fighting for clean air and water, and advocating for renewable energy sources within California.

The other organizations mentioned are also involved in environmental conservation efforts but may not focus exclusively on California. The Environmental Protection Agency operates at a federal level and addresses environmental protection across the entire country. The National Audubon Society primarily focuses on birds and their habitats, which can be national but is not solely confined to California. Similarly, the National Wildlife Federation works on wildlife conservation at a larger scale, impacting multiple states and regions rather than centering on California specifically.