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, crop - (the total amount collected of) a plant such as a grain, fruit, or vegetable grown in large amounts:, resourse - a useful or valuable possession or quality of a country, organization, or person, organic - not using artificial chemicals in the growing of plants and animals for food and other products:, impact - the force or action of one object hitting another, emission  - an amount of something, especially a gas that harms the environment, that is sent out into the air, climate change - 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, flooding  - a situation in which an area is covered with water, especially from rain, artificial - made by people, often as a copy of something natural, wildlife - animals and plants that grow independently of people, usually in natural conditions,

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