Forested wetlands are called as swamps. They are located all around the world. Freshwater swamps form along large lakes and rivers. Saltwater swamps are found along tropical and sub tropical coastlines.
Around 1750, at the dawn of the Industrial Revolution, the world population was 550 million. World population exploded in the eighteenth century after the Industrial Revolution. Human population increased more than ten times in the past 500 hundred years. In the twentieth century itself the population has increased four times. Nearly 80 million people are added each year.
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