The enormous amount of radiation of the Sun hits the Earth constantly. This solar radiation strikes the Earth in the form of the visible light, including the ultraviolet , infrared and other types of radiation that are invisible to the human eye. The exchange of the incoming and the outgoing radiation that warms the earth is called the green house effect. Its mechanism is as similar as the greenhouse.
The greenhouse effect warms the Earth’s surface naturally. It describes the condition when the energy of the Sun reaches the atmosphere of the Earth, wherein some of it are reflected back to space and the rest are absorbed. At night, Earth’s surface cools, releasing the heat back into the air.
Greenhouse gases includes water vapour, carbon dioxide, methane, ozone and some artificial chemicals such as chlorofluorocarbons . The absorbed energy warms the atmosphere of the Earth. This process sustains the temperature of the Earth that is warm allowing life on Earth to exist. The natural green house effect is dangerous to the life as the human activities like cutting trees, burning fossils fuels, etc have strengthen the natural green house effect that leading to the global warming.
Solar energy passes through the atmosphere and warmth the earth. About 30% of the energy is reflected back into the space. Green house gases in the atmosphere traps the remaining energy. The solar radiation is absorbed by the oceans lands and the atmosphere. As they heat up, the oceans land and the atmosphere release heat, which passes out of the atmosphere and into the space.
Since the beginning of the Industrial Revolution, the atmospheric carbon dioxide levels have increased by more than 40%. Without the natural greenhouse effect, the earth would be much colder than what it is at present.