Meaning of Global Warming : 

Due to increasing process of industrialization, quantity of carbon dioxide (CO2) is increasing in atmosphere, which causes greenhouse effect. The increasing amount of carbon dioxide gas on earth prevents the Long-wave radiations emitted by earth upon cooling from escaping into space. Due to this, the average temperature of the earth increases with the concentration of thermal energy in the atmosphere. This is called global warming.

Causes of Global warming : 

Following are the major causes :

1. Due to human activities, the quantity of greenhouse gases is increasing. 

2. Emission from industries and vehicles is increasing the amount of carbon dioxide. 

3. Rapid deforestation is also a major cause of this increase. 

4. Refrigerators, fire extinguishers, CFC are the major causes of global warming. CFC decays ozone covering which stop U.V rays from reaching the earth. According to scientists, there has become a big hole in ozone layer and the U.V rays are directly reaching on earth.

5. The use of fossil fuels is increasing the quantity of carbon dioxide, which is increasing the temperature of earth.

Effects of Global Warming : 

1. Atmosphere’s increasing temperature is a challenge. In last ten years, the earth’s temperature has increased by 0.3 to 0.6 Celsius. 

2. Due to increasing temperature of earth, glaciers are melting and the water is going into the sea and this has increased sea levels. Consequently, there is possibility, of the erosion and submergence of coasts and the people living near coastal areas would become homeless. 

3. This increasing temperature is causing an adverse effect on man’s health. Epidemic diseases are spreading, and there may be crises for fresh water, fresh food and pure air for breathing. 

4. It is considered that due to increase of temperature, the animals and birds will migrate towards the mountains and some plants, animals and birds will lose their existence. 

5. Due to more hot summers the air conditioners will be used more, consequently with increase of CFCs, destructive effect will be seen on ozone layer.