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Do not you feel that some years the weather is getting more and more uncertain. Oh! Of course for those who never care about nature where ever think of it. But try to think about it even if it's only one day, so you'll say oh, right. Lately the weather is unpredictable, hot, rainy for a while and surely you will also think What is the cause of this all. The answer is Global Warming or global warming. So what is global warming this and what is the cause of global warming ?.
Global warming is a process of increasing the average temperature of the atmosphere, the ocean and the Earth's land. The global average temperature on the surface of the Earth has increased by 0.74 0.18 C (1.33 0.32 F) over the last hundred years. The Intergovernmental Panel on Climate Change (IPCC) concludes that, "most of the increase in global average temperatures since the mid-20th century is likely due to increased concentrations of greenhouse gases due to human activities through the greenhouse effect. causing other changes such as rising sea levels, increased intensity of extreme weather phenomena, and changes in the number and patterns of precipitation.Another result of global warming is the hearing of agricultural products, the disappearance of glaciers, and the extinction of various species of animals. we feel it is not.
According to experts there are several causes of global warming are:
1. Greenhouse Effects: Any energy source on Earth comes from the Sun. Most of the energy is in the form of shortwave radiation, including visible light. When this energy comes to the surface of the Earth, it changes from light to warmth that warms the Earth. The surface of the Earth, will absorb some of the heat and reflect back the rest. Some of this heat is in the form of long-wave infrared radiation into outer space. However, some of the heat remains trapped in the Earth's atmosphere due to the buildup of greenhouse gases, among others, water vapor, carbon dioxide, sulfur dioxide and methane, which trap these radiation waves. These gases absorb and reflect back the radiation of the waves emitted by the Earth and consequently the heat will be stored on the surface of the Earth. This situation occurs continuously so that the average annual temperature of the earth continues to increase. These gases work as greenhouse gases. With the increasing concentration of these gases in the atmosphere, more heat is trapped beneath. This greenhouse effect is needed by all living things on earth, because without it, the planet will become very cold. With an average temperature of 15 C (59 F), the earth has actually been hotter 33 C (59 F) than its original temperature, if there is no greenhouse effect the Earth's temperature is only -18 C so that the ice will cover the entire surface of the Earth. On the contrary, if these gases have been excessive in the atmosphere, it will lead to global warming.
2. Feedback Effect: The elements of the cause of global warming are also influenced by the various feedback processes it produces. An example is the evaporation of water. In the case of warming due to the increase of greenhouse gases such as CO2, warming up will initially cause more water to evaporate into the atmosphere. Since water vapor itself is a greenhouse gas, heating will continue and increase the amount of water vapor in the air until an equilibrium water vapor concentration is reached. The greenhouse effect it produces is larger when compared to the CO2 gas itself. (Although this feedback increases the absolute water content in the air, the relative humidity of the air is almost constant or even slightly decreased as the air becomes warmer). This feedback only affects slowly because CO2 has a long life in the atmosphere. The effect of feedback due to the influence of clouds is becoming the object of current research. When viewed from below, the cloud will reflect infrared radiation back to the surface, thus increasing the warming effect. On the contrary when viewed from above, the cloud will reflect sunlight and infrared radiation into space, thus increasing the cooling effect. Whether its net effect produces heating or cooling depends on certain details such as the type and height of the cloud. These details are difficult to represent in climate models, partly because the clouds are very small when compared to the distance between computational limits in the climate model (about 125 to 500 km for the model used in the Fourth IPCC View Report). Nevertheless, cloud feedback is ranked second in comparison to vapor feedback and is considered positive (adding to warming) in all models used in the Fourth IPCC View Report. Another important feedback is the loss of light reflecting ability