unleaded petrol - Petrol not containing lead and therefore less harmful to the environment, tidal energy - Energy that comes from the movement of water driven by the gravitational pull of the Moon., desertification - The gradual transformation of habitable land into desert; is usually caused by climate change, fumes - gases ejected from an engine as waste products, greenhouse effect - Warming that results when solar radiation is trapped by the atmosphere; caused by atmospheric gases that allow sunshine to pass through but absorb heat, acid rain - rain containing high amounts of chemical pollutants, extinct - no longer in existence., solar power - energy from the sun that is converted into thermal or electrical energy., recycle - To collect used paper, glass, plastic, etc., and put if through a process so that it can be used again, deforestation - the cutting down of trees in a large area;, disposable products - products designed for one-time use, drought - a long period of dry weather without rain., emission - the act of sending out gas, heat, light, etc., flood - a large amount of water covering an area that is usually dry,

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