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desertification : the process by wich a desert grows or a region becomes a desert
part of speech noun : desertification was caused by intensive farming in the area
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solid waste : material such as household trash , food waste , yard waste , construction debris , scrap metal and so on
part of speech noun : solid waste is disposed of in a iandfill
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global warming _ the increase in the world's temperature caused by the increase of greenhouse gases in the atmosphere
part of speech noun :world leaders need to address the problem of global warming
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climateclimate change : long term changes in earth's climate , such as rising temperatures and lower rainfall
.part of speech noun: climate change is affecting every country on every continet
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endangered species : a species of animal or plant that is at risk of extinction
part of speech noun: the bald eagle is no longer an endangered species
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folding knife : a knife with a blade that folds into the handle
part of speech noun : folding knives are very versatile
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deforestation : the act or process of removing all or most of the trees from a forest
part of speech : deforestattion of hills and mountains contributes to mudslides when there's heavy rain
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coastal flooding : when dry , low-lying land is flooded by seawater
part of speech noun: coastal flooding will affect millions of people if sea levels rise
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overfishing : the act of catching too many fish so there are not many left
part of speech noun : A lot of fish species are in danger due to verfishing
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greenhouse gas : any of the gases that trap heat in the atmosphere and contributr to global warming
part of speech noun :greenhouse gases include water vapor , carbon dioxide and methane
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air pollution : contamination of the air by smoke and gases
part of speech noun : the most serious air pollution comes from the burning of fossil fuels
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untreated sewage : sewage that has not been processed to remove contaminats
part of speech noun : the bay was polluted with untreated sewage
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acid rain : rain , snow or sleet containing hamful chemicals from the burning of fossil
part of speech noun : acid rain can pollute water and soiln , harm crops and trees and even damage the surface of buildings
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fossil fuel : a natural fuel , such as coal or oil , formed far underneath the ground and over millions of years from the remains of living things
part of speech noun :burning fossil fuels releases harmful gases
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