Global Warming

World focus problem which called global warming. The definition of global warming is gradual increase in the earth’s surface temperature. This issue cause by human or by natural. Unfortunally most people don’t believe or don’t take this problem seriously. There many causes led global warming. Let me now outline the main cause of global warming. Greenhouse gases, such as carbon dioxide (CO2), methane (CH4), water vapor, and fluorinated gases, act like a greenhouse around the earth. This means that they let the heat from the Sun into the atmosphere, but do not allow the heat to escape back into space. The more greenhouse gases there are, the larger the percentage of heat that is trapped inside the earth’s atmosphere. The earth could not exist in its present state (that is, with life) without the presence of some naturally occurring greenhouse gases, such as CO2, CH4, and water vapor. Without any greenhouse gases no heat would be trapped in atmosphere, so the earth would be extremely cold.