Annual - happening once every year, or relating to a period of one year, Area - a part of a building or piece of land used for a particular purpose, biodiversity - the number and types of plants and animals that exist in a particular area, cause - to make something happen, especially something bad, challenge - something that is difficult and that tests someone's ability or determination, climate change - the way the Earth's weather is changing, consequence - the result of a particular action or situation, especially a bad result, decade - a period of ten years, especially a period such as 1860 to 1869, or 1990 to 1999, deforestation - when all the trees in a large area are cut down, drought - a long period when there is no rain and people do not have enough water, effect - the result of a particular influence, emission - when gas, heat, light, etc. is sent out into the air, or an amount of gas, heat, light, etc. that is sent out, erosion - when soil, stone, etc. is gradually damaged and removed by the sea, rain, or wind, flood - a large amount of water covering an area that is usually dry, fossil fuel - fuels such as gas, coal and oil that were formed underground from plant and animal remains millions of years ago, glacier - a large mass of ice that moves very slowly, usually down a slope or Valley, global warming - a gradual increase in world temperatures caused by polluting gases, graze - when cows or other animals graze, they eat grass, greenhouse gas - a gas that causes the greenhouse effect, especially carbon dioxide, issue - a subject or problem which people are thinking and talking about, predict - to say that an event or action will happen in the future, especially as a result of knowledge or experience, submerge - to cause something to be under the surface of water, or to move below the surface of water, subsistence farming - farming that provides enough food for the farmer and their family to live on but not enough for them to sell, environment - the air, land and water where people, animals and plants live, trend - a general development or change in a situation or in the way that people are behaving,

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