drought - a long period of time with no rain, flood - a large quantity of water that covers an area, global warming - the increase in the temperature on Earth, greehouse effect - when heat cannot escape from atmosphere and the temperature goes up , melt - when ice turn into water, nuclear disaster - an accident with nuclear power , oil spill - an accident when oil comes out of its container , ozone layer - part of the atmosphere which protects the earth from the sun, pollution - making air, water, and land worse with chemicals , recycle - give another use to plastic , paper, glass....., save - reserve, waste - material eliminated or discarded as no longer useful,

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