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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