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Pollution means surroundings are dirty and harmful so we need to start to  grow trees and start eradicating this problem
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An increase in the number of people that reside in a country, state, county, or city. To determine whether there has been population growth, the following formula is used: (birth rate + immigration) - (death rate emigration).

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An increase in the number of people that reside in a country, state, county, or city.

 It is expressed in terms of:
1) Absolute Increase/ Absolute numbers: This is the no. of people added to the population each year or decade. It is obtained by subtracting the old population from the current population 
2) Annual Growth Rate: This is the pace or rate of increase of population expressed in terms of percentage. 
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