desertification, a type of gradual land degradation of fertile land into desert, greenhouse effect, the process through which heat is trapped near Earth’s surfac, contaminated, the synonym of the word 'polluted', tidal energy , power produced by the surge of ocean waters, unleaded gas, gas without an addition of a lead, green belt, an area of farmland in which it is restricted to build withinin , exhaust fumes, the gas or steam that is produced when the engine of a vehicle is runnin, face extinction , be on the verge of dissapearing , gyre, a circular pattern of ocean currents, biofuels, a fuel that is produced from biomass.

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