Environmental indicators are simple measures that tell us what is happening in the
environment. Since the environment is very complex, indicators provide a more practical and economical way to track the state of the environment than if we attempted to record every possible variable in the environment. For example, the health of
amphibian populations are often monitored as they are very sensitive to changes in their habitats and may provide early warning of ecological impacts from climate change, loss of stratospheric ozone, habitat alterations, or the presence of pesticides.
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A measurement, statistic or value that provides a proximate gauge or evidence of the effects of environmental management programs or of the state or condition of the environment.
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