to threaten  - All forms of life are threatened., exhauted pipes - gases and particles expelled from an engine., urban areas - developed, densely populated area where most inhabitants have nonagricultural jobs., microbes - tiny organism, usually a bacterium., chemical poisons - a substance used in chemistry or produced by a chemical process, ice sheet - thick layer of glacial ice that covers a large area of land., remote places - distant or far away., microscopic plastic - very small., water currents - steady, predictable flow of fluid within a larger body of that fluid, winds - movement of air (from a high pressure zone to a low pressure zone) caused by the uneven heating of the Earth by the sun, radioactive - having unstable atomic nuclei and emitting subatomic particles and radiation., nuclear reactor - a large machine that produces nuclear energy, especially as a means of generating (generate) electricity, landscape - an area of countryside or land of a particular type, used especially when talking about its appearance, power plants - industrial facility for the generation of electric energy., air pollution - harmful chemicals in the atmosphere, water pollution - introduction of harmful materials into a body of water., land pollution - introduction of harmful materials into the surface environment,

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