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ecological footprint

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the total amount of functioning ecosystem needed both to provide the resources that a human population uses and to absorb the wastes that the population generates

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global warming

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increase in the average temperatures on Earth

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climate change

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measurable long-term changes in averages of temperatures, clouds, winds, precipitation, and frequency of extreme weather events such as floods, major storms, and heat waves

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ozone layer

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atmospheric layer in which ozone gas is relatively concentrated; protects life on Earth from harmful ultraviolet rays in sunlight

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deforestation

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the cutting down of forests

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reforestation

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the process of replanting an area with trees

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invasive species

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non-native species whose introduction causes, or is likely to cause, economic harm, environmental harm, or harm to human health

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pollutant

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any harmful material created as a result human activity and released into the environment

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biological magnification

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increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain/food web

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biodiversity

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total of the variety of organisms in the biosphere