Hello everybody,
There has been a lot of discussion among scientists whether climate change is a natural phenomenon or results from human beings since the Earth’s climates have been changing throughout the past hundreds of thousand years! However, nowadays almost all of the scientists believe that humans are the major part causing global warming. It is evident that human activities play an important role in accelerating the violence of global warming rather than its natural pace.
In general condition, the earth receives 99.95% heat energy from the sun in the form of solar radiation. The rest of the heat comes from geothermal energy and radioactive decay within the earth itself. Since ancient times our world has perfectly maintained the balance of energy by reflecting and radiating the heat waves, derived from the sun, through the atmosphere. As a result, the net energy that the earth obtains a day is zero, bringing about a suitable weather conditions to all creatures on earth.
One of the mechanisms which help remain the globe’s heat energy is Greenhouse Effect. Covered by greenhouse gases, the earth can capture and absorb the heat, and reflect it back into the earth. Imagine the earth had no greenhouse gases, what would happen? Surely the world cannot maintain its energy. Furthermore, there must be a lot of fluctuation of the temperatures in every single day. These gases, accordingly, function as the earth’s thin blanket covering our cold world.
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http://earthobservatory.nasa.gov/Features/EnergyBalance/images/global_energy_budget_components.png
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Nevertheless, in the past decades, there has been a high amount of greenhouse gases accumulating in the atmosphere due to various human activities, especially burning fossil fuels and deforestation. This increase of the greenhouse gases, acting like a thicker blanket, makes the heat inside the globe unable to release to the space; consequently, the earth temperature continually rises.
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