landfill - the process of getting rid of large amounts of rubbish by burying it, or a place where rubbish is buried:, deforestation - the cutting down of trees in a large area, or the destruction of forests by people, artifical - made by people, often as a copy of something natural:, pollution - damage caused to water, air, etc. by harmful substances or waste:, thunder - the sudden loud noise that comes from the sky especially during a storm:, oil spill - an accident in which oil has come out of a ship and caused pollution, flood - to cause to fill or become covered with water, especially in a way that causes problems, fertilizer - a natural or chemical substance that is spread on the land or given to plants, acid rain - rain that contains large amounts of harmful chemicals as a result of burning substances such as coal and oil, solar power - electricity produced by using the energy from the sun,

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