Nowadays, there are huge amounts of surrounding problems due to 
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 globalization. Some individuals believe that the most important issue is 
about Change preposition
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 the loss of the diversity of living 
beingFix the agreement mistake
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 . Others argue that there are a lot of 
crisisesCorrect your spelling
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  which are more critical. In my perspective, I agree with the latter one. 
The extinction of particular species of plants and wildlife become the main environmental 
problemsFix the agreement mistake
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  because 
 is the initiation of the imbalance ecosystem. Our environment consists of abundant ecosystems which are connected to each other. 
, when one of the species is  being abolished and  disappeared respectively, the hazardous effects will be caused. 
, when lacking in some kinds of greenery 
 as seaweed, 
the dugong consuming only 
these seaweedChange the determiner
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  will be the 
 type of creatures that die of hunger. After that, any other marine species will 
be faceChange the verb form
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  with the same terrible situation and 
 become extinct in the future. 
, 
 loss will 
continueAdd the particle
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  have an effect not only on animals but 
 on humans. There will be a lot of poor people from undeveloped 
countryFix the agreement mistake
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  losing their lives due to 
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 hunger. 
, other environmental problems 
 as climate change and 
Correct your spelling
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green houseCorrect your spelling
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  effects are more crucial than the creatures' extinction because 
 situation is affected directly in the entire world. The 
increasingReplace the word
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  of the sea level due to 
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 human activities 
 as industrial development is one of 
factorsAdd an article
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  whichCorrect pronoun usage
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  cause severe catastrophes. Some countries will sink into the bed of the ocean because of the higher level of the sea. 
 natural disaster will happen in every country of the world. 
, people should pay the most attention to 
 problem. All 
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 nationsAdd an article
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  have to take action immediately. 
, 
 is why climate change is the primary environmental issue. 
In conclusion, having considered the matter carefully, 
 the loss of types of wildlife creatures is essential, the most urgent environmental situation is the uncontrollable emission of carbon dioxide.