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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