"Global warming threatens our health, our economy, our natural resources, and our children's future. It is clear we must act"- Eliot Spitze
Global warming is defined as unusual rapid increase in Earth's average surface temperature due to the greenhouse gases released by people burning fossil fuels. In simple terms global warming happens when the temperature increases. Since 1980 average surface temperature has increased more than two thirds as compared to past climatic warming. This is also called as green house effect which occurs when methane and carbon dioxide accumulate more in the environment and retains heat from the sun in the atmosphere causing warming. Global warming hurts many people, plants and animals. Not only greenhouse gases, but also other chemicals cause air pollution and negative impact on the environment.
Global warming can happen by natural causes or some man made factors.
The natural causes include:
Below human factors also responsible for the global warming:
Using chemical fertilizers in agriculture It is a well known fact that green house gases increase the earth's temperature by 24 percent with carbon dioxide contributing to about 12 percent of it, water vapor 36 percent, Methane 5 to 10 percent and Ozone 3 to 7 percentage.
The common green house gases are as follows:
Solar variation is another cause of global warming which occurs due to the changes in the amount of radiant energy emitted by the sun. This solar variation changes along with the earth's climate and temperature. Sun spots are also a cause of global warming. The sun is the major source of energy factor to the earth. Orbital forcing is also one of the main causes of global warming. Due to growing industrialization temperature has increased in the last decades. Global warming was started some 8000 years ago with the advent of agriculture and deforestation resulting in an increase in carbon dioxide in the environment.
Global warming causes great impact on human beings. High temperature due to global warming causes various diseases like west Nile and malaria. This shows a remarkable impact on a person's health as well as on economy. Increasing diseases make countries spend more on medications and vaccinations. Otherwise drastic change in the temperature also causes other health problems like cardiovascular problems, heart stroke and respiratory problems. Drastic rise in temperature levels sometime lead to mortality also. High temperature also creates other problems like- it releases harmful pollutants into the environment and causes respiratory problems like asthma and damage to lung tissues. Increasing temperature levels also decline the ground water levels and it impacts a lot on the agriculture production. High temperature also causes decreased sea levels. It also increases the cost of costal defenses. Warming also affects the ecosystems and decreases snow levels.
Climate change impact in India:
Some practical experiences of global warming effects:
Impact on coastal Orissa:
The government has taken many initiatives to stop global warming. The government has introduced Clean Air Act to reduce the airborne contaminants, smog and air pollution in general. By 2015 all products listed on the Clean Air Act will have a label (warning) on them. The pollutants cause cancer, birth defects in a new born child, breathing obstacles, brain and nerve damage, lung injuries and burning eyes. Government has taken many controlling measures by initializing the clean air act.
The Eight National Missions Constituted are: -
1. Myth: The temperature caused with global warming is not unusual. Decade back also earth experienced the same temperature. It is the part of the natural cycle.
Fact: This is not true. Recent studies reveal that, the temperature recorded in previous years was less compared to recent years.
2. Myth: The recent global warming observed is caused by the urbanization and deforestation not green house gases.
Fact: It is not proven one. Green house gases are the major cause of global warming.
3. Myth: As per the reports of satellites, earth has not been warming
Fact: False. These satellites do not measure surface air temperature, or ground temperature
4. Myth: Human produced carbon dioxide has increased in the last 100 years, which is warming the earth in a remarkable way.
Fact: It is true that, since the industrial revolution CO2 content has increased from 0.2% to 0.4%. It is also known that carbon dioxide is increasing in a remarkable way.
5. Myth: CO2 is the common green house gas
Fact: Green house gases form 3% of atmosphere volume.
6. Myth: Global warming causes more storms and other weather extremes.
Fact: There is no scientific proof that supports the above statement on global scale.
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