Final answer:
Plastics are man-made materials that pose a significant threat to the environment due to their non-biodegradable nature and long-term presence.
Explanation:
Plastics are materials that contaminate the environment due to their resistance to degradation, leading to long-term presence in the environment. Plastics are not easily broken down by microorganisms, causing waste disposal issues and posing a threat to the environment by contributing to air and water pollution. Their persistence and non-biodegradability make them a major environmental concern.
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