The introduction of harmful substances into the air is called

Plants/animals that are not native and cause damage to an ecosystem

Farming without the use of chemical fertilizers

If a product will break down naturally, not harming the environment, it is called

Involves materials and practices that do not cause harm to the environment

Any type of energy with a source that won't run out such as solar and wind power

The illegal taking of wildlife

Something that is found in nature and can be used by people such as trees, animals, plants,

When someone says Go Green! they mean

Human activities that change an ecosystem (for the worse) or destroy a natural ecosystem

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