According to the International Union for Conservation of Nature and Natural Resources (IUCN), 73% of species have become extinct, endangered, vulnerable, or rare because of

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Alteration or destruction of physical habitat is the leading cause of species becoming extinct, endangered, vulnerable, or rare, according to IUCN. Habitat loss is primarily caused by human activities such as deforestation, urbanization, and agriculture. This directly impacts species' ability to survive and reproduce in their natural habitat. Chemical pollution, stratospheric ozone depletion, overexploitation of species, and global climate change also contribute to species decline, but to a lesser extent than habitat loss.