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Ecosystems Science Resources

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Ecosystems Science

Science at EPA provides the foundation for credible decision-making to safeguard human health and ecosystems from environmental pollutants.

Research Programs


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Environmental Indicators

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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Risk and Exposure

EPA considers risk to be the chance of harmful effects to human health or to ecological systems resulting from exposure to an environmental stressor.

Risk Assessment and Characterization


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Aquatic Ecosystems

Empowered by the Clean Water Act, the EPA strives to manage, protect and restore the water resources and ecosystems of the nation's marine and fresh waters.

Wetlands and Watersheds

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