Bio Human Impacts - The Impact of Humans The Global...

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The Impact of Humans The Global Environment • The biosphere represents ecological relationships between >7 billion humans and the 5 to 100 million other species on Earth. • Every species (including humans) needs a share of Earth's resources to exist. Biod iversity • Biodiversity is defined as the variety of life on Earth Described in terms of the number of species • Currently, biodiversity is in decline • Conservation biology tries to reverse the trend of extinctions. Direct values of biodiversity: Medicinal value - most prescription drugs are originally derived from organisms Agricultural value - modern crops were derived from natural species (e.g. corn, wheat, rice, etc.) E1 Consumptive value - many wild species are directly consumed (e.g. fruits, vegetables, beeswax, etc.) Indirect values of biodiversity: Biogeochemical cycles - carbon, nitrogen, phosphorus cycling l Waste disposal - sewage treatment plants use bioremediation ED Provision of freshwater - plants are integral in the water cycle
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