Language, knowledge, and the environment have been intimately related throughout human history.

This relationship is still apparent especially in indigenous, minority, and local societies that maintain close material and spiritual ties with their environments. Over generations, these peoples have accumulated a wealth of wisdom about their environments and its functions, management, and sustainable use. Traditional ecological knowledge and practices often make indigenous peoples, minorities, and local communities highly skilled and respectful stewards of the ecosystems in greatest need of protection. Local, minority, and indigenous languages are repositories and means of transmission of this knowledge and the related social behaviors, practices, and innovations.

As with biological species, languages and cultures naturally evolve and change over time.

But just as with species, the world is now undergoing a massive human-made extinction crisis of languages and cultures.

External forces are dispossessing traditional peoples of their lands, resources, and lifestyles; forcing them to subsist in highly degraded environments; crushing their cultural traditions or ability to maintain them; or coercing them into linguistic assimilation and abandonment of ancestral languages. People who lose their linguistic and cultural identity may lose an essential element in a social process that commonly teaches respect for nature and understanding of the natural environment and its processes. Forcing this cultural and linguistic conversion on indigenous and other traditional peoples not only violates their human rights, but also undermines the health of the world's ecosystems and the goals of nature conservation.

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