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Conservation

An estimated 31% of the world's oak species are threatened with extinction, while 41% of oak species are considered to be of conservation concern. The countries with the highest numbers of threatened oak species (as of 2020) are China with 36 species, Mexico with 32 species, Vietnam with 20 species, and the US with 16 species. Leading causes are climate change and invasive pests in the US, and deforestation and urbanization in Asia. In the Himalayan region of India, oak forests are being invaded by pine trees due to global warming. The associated pine forest species may cross frontiers and integrate into the oak forests. Over the past 200 years, large areas of oak forest in the highlands of Mexico, Central America, and the northern Andes have been cleared for coffee plantations and cattle ranching. There is a continuing threat to these forests from exploitation for timber, fuelwood, and charcoal. In the US, entire oak ecosystems have declined due to a combination of factors thought to include fire suppression, increased consumption of acorns by growing mammal populations, herbivory of seedlings, and introduced pests. However, disturbance-tolerant oaks may have benefited from grazers like bison, and suffered when the bison were removed following European colonization.