Global warming is the increase in the average temperature of Earth's near-surface air and oceans since the mid-20th century and its projected continuation. According to the 2007 Fourth Assessment Reportby the Intergovernmental Panel on Climate Change (IPCC), global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 20th century.Most of the observed temperature increase since the middle of the 20th century has been caused by increasing concentrations of greenhouse gases, which result from human activity such as the burning of fossil fuel and deforestation.Global dimming, a result of increasing concentrations of atmospheric aerosols that block sunlight from reaching the surface, has partially countered the effects of warming induced by greenhouse gases.<br />
Global Warming its cause and effects<br />Its shows that greenhouse gasses are emissions that rise into the atmosphere and trap the suns energy keeping heat from escaping and that’s why Its affects the temperature of the earth , also the cause of these problems are the smokes of the vehicles and factories , the predictions of the global warming are the increasing of the hot summers and intese thunderstorms , so the total temperature of the earth is risen about 1 degree Fahrenheit.<br />
Signs of Global Warming<br />This may happen if we people do not taking care of the mother earth , so in preventing this we should avoid littering and avoid using electricity and also plant more trees.<br />
Greenhouse Gasses<br />Cause<br />Greenhouse gases in the atmosphere (see above) act like a mirror and reflect back to the Earth a part of the heat radiation, which would otherwise be lost to space. The higher the concentration of green house gases like carbon dioxide in the atmosphere, the more heat energy is being reflected back to the Earth. The emission of carbon dioxide into the environment mainly from burning of fossil fuels (oil, gas, petrol, kerosene, etc.)<br />Effect<br />When sunlight reaches Earth's surface some is absorbed and warms the earth and most of the rest is radiated back to the atmosphere at a longer wavelength than the sun light. Some of these longer wavelengths are absorbed by greenhouse gases in the atmosphere before they are lost to space. The absorption of this longwave radiant energy warms the atmosphere. These greenhouse gases act like a mirror and reflect back to the Earth some of the heat energy which would otherwise be lost to space. The reflecting back of heat energy by the atmosphere is called the "greenhouse effect".<br />
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