Native plant species play an important role in the social, cultural, and economic traditions of those who live on the landscape. Plants provide food, medicine, shelter, dyes, fibers, oils, resins, gums, soaps, waxes, latex, tannins, and insect repellant. Plants and trees, valued for beauty and fragrance, contribute to the air people breathe. People use plants in ceremonial or spiritual rituals. Humans depend upon plants, and their important pollinators, for existence and survival. Plants that previously only grew in one region are shared throughout the world today as appreciation for specific plant products has spread. Plants also serve as sources of fuel, tools, clothing, and comfort.