• High levels of personal wellness can only be sustained if the environment is conducive to well-being.
• All the animals, plants, and natural resources in any particular habitat forma self-sustaining ecosystem.
• All parts of and ecosystem are interdependent.
• Each ecosystem is linked to all other ecosystems to form a global network called an ecosphere. Thus change in one ecosystem has the potential to affect any other ecosystem and the ecosphere as a whole.
• Because human beings have the ability to alter and manipulate the environment, human activities have the greatest impact on ecosystems.
• Human activities have caused extensive harm to the environment, which has affected environmental health.
• The major sources of pollution are air impurities, water contaminants, hazardous chemicals, solid waste, radiation, and noise.
• Overpopulation has also resulted in environmental problems.
• Conservation of natural resources, preservation of ecosystems, and protection of the environment from pollution are essential for preserving the ecosphere.
• Preservation of the ecosphere must stem both from individual and public action.

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