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This present study’s aim conducted by researchers of NASA’s jet propulsion laboratory and the California Institute of technology of Pasadena was to calculate the Earth’s ecological sensitivity towards climate changes. The study predicted that by 2100, climate changes will modify almost half of the plants communities covering the planet. As a result of rising human-produced greenhouse gases, the Earth’s climate is changing tremendously.

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The purpose of  the article from the United States Environmental Protection Agency (EPA) is to discuss about the consequences that influence ecosystems in America. The researchers points out 6 of them: Life cycle event, range shifts, food web disruption, threshold effects, parasites and diseases and extinction. Their data comes mainly from other U.S. governmental organization reports, before President Trump’s election.     

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In the article “Population is still the biggest problem facing humanity”, Gary Peters argues that the number of people on earth will soon outstrip our natural resources. In order to solve this important problem, he thinks that we should implement rules in countries where the amount of birth is still very high. Another important point is that Peters underline the fact that the number of birth should go down instead of waiting for the death rates to go up, it is very important that population growth stops now, otherwise the human race will suffer from it.

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