Population Change

There was very slow motion in population growth before 1650 AD in the history of population change. There was estimated about 250 million total population in the world in 1 AD. It took 1650 years to reach 500 million populations in the world. World population reached 1 billion in 1820. In 1930 and in 1975 the world population reached 3 & 4 billion. Population growth rate has seen rapid way so world population can be seen 5 billion in 1987. There are more than 7 billion populations in present world.

Greenhouse effect

Sun light keeps warm atmosphere and earth surface. The worming process is growing day to day by sun light on atmosphere. Greenhouse effect is called the process of warming atmosphere and earth surface by causes of human productive carbon dioxide and Methane gases. Generally, sun light coming process on earth and reflection towards space as radiation move on naturally that makes constant temperature on atmosphere and being warm on earth. But, difference causes product carbon dioxide and Methane gases on atmosphere as green gases these gases block the infrared ray of sun from reflection towards space. That’s way radiation sum as heat atom so greenhouse impact. It is also called global warming.

Sources of Greenhouse Gases

1. carbon dioxide gas is origin from natural gas, oil, coal, as biological flue industrial activities, heating power center and suing vehicle.
2. Chloroform carbon (CFCS) gas is origin from refrigerator, air conditioner, plastic form factory.
3. Methane gas is origin from domestic dirt and garbage.
4. Nitrite oxide gas is origin from increasing and decreasing process of nitrogen atom, forest and grass land conflagration and fire of biological flue.