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Pollution the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
Over-Hunting to hunt (an area) excessively to the point that the kinds of animals hunted become scarce overhunting certain regions of the country.
Population all the inhabitants of a particular town, area, or country.
Deforestation and Habitat loss When a natural habitat, such as a forest or wetland, is altered so dramatically that it no longer supports the species it originally sustained. Plant and animal populations are destroyed or displaced, leading to a loss of biodiversity.
Invasive Species plants and animals that have migrated to places where they are not native.