Both the Sierra Club and the National Park Service play crucial roles in protecting and preserving the Sierra Nevada's ecosystem.

Sierra Club: This is a prominent environmental organization with a long history of advocating for the protection of the Sierra Nevada. They work on various issues, including wilderness preservation, sustainable resource management, and addressing threats like climate change.

National Park Service: This federal agency is responsible for managing and protecting national parks like Yosemite and Sequoia, which are located within the Sierra Nevada. They work to conserve natural resources, provide recreational opportunities, and educate the public about the importance of environmental protection.

These organizations, along with other government agencies, research institutions, and local communities, play vital roles in safeguarding the unique and fragile ecosystem of the Sierra Nevada.