climate changes - changes in the world's weather, in particular the fact that it is believed to be getting warmer as a result of human activity increasing the level of carbon dioxide in the atmosphere, fossil fuel - fuels, such as gas, coal, and oil, that were formed underground from plant and animal remains millions of years ago, global warming - a gradual increase in world temperatures caused by gases such as carbon dioxide that are collecting in the air around the earth and stopping heat escaping into space, greenhouse gases - a gas that causes the greenhouse effect, especially carbon dioxide, polar ice caps - a thick layer of ice that permanently covers an area of land, rain forest - a forest in a hot area of the world that receives a lot of rain, renewable - Renewable forms of energy can be produced as quickly as they are used, sea level - the average height of the sea where it meets the land, surface - the outer or top part or layer of something,

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