Leo club of Kathmandu Fulbari concern.....

GLOBAL WARMING: The world beneath it........

                   

Over the last 100 years, the average temperature on the earth has gone up by 0.6° C.  It doesn't sound much but people are very worried. This change in temperature is called Global warming. If Global is warming carries on, many plants and animals living today on earth, including us will have some serious problems. It could also mean more droughts and floods.

                     Global warming is caused by the greenhouse effect. It is hot (warmer) inside a greenhouse than outside because rays of sunlight pass through the glass of the green house and are "soaked by" the plants and soil. The plants and soil warm up and give out heat. Although the green house glass sunlight in, it doesn't let all the heat out so some of the heat is trapped inside the greenhouse and it warms up.

                    The atmosphere is made up of gases around the earth where we live. They are called greenhouse gases. The atmosphere is a bit like the glass of green house. It lets sunlight pass through easily but stops some of the heat getting out. So, when the rays of sunlight hit the earth, it warms up. The earth gives out heat but not all of it escapes into the outer space. Some of it gets trapped closed to the earth and this warms up the air around us. Without the greenhouse gases, the earth would be 33° C colder. It would not be warm enough for plants and animals to survive. The way the greenhouse gases keep the atmosphere at a suitable temperature is called the greenhouse effect.

                 Some greenhouse gases occur naturally in the atmosphere, while others result from human activities. Naturally occurring greenhouse gases include water vapor, carbon-dioxide, methane, nitrous-oxide and ozone. Certain human activities, however add to the levels of these naturally occurring gases.

                 Carbon-dioxide is released to the atmosphere when solid waste, fossil fuels (oil, natural gas and coal) and wood products are burned.

                   Methane is emitted during the production of transport of coal, natural gas and oils. Methane emissions also result from the decomposition of organic waste in municipal solid waste, landfill and the raising of livestock.

                 Nitrous oxide is emitted during agriculture and industrial activities, as well as during combustion of solid waste and fossil fuels.

                Very powerful greenhouse gases that are not naturally occurring include hydro-fluorocarbons (HFC5), perfluoro-carbon(PHC5), Cholorofluro-carbon(CFCs) and sulfur hexafluoride(SF6), which are generated in variety of industrial processes.

               With an overall conclusion we can say that it’s a matter of great problem and concern about thinking and planning what is good and better for the entire globe and for all the human beings. Reduction of this problem is matter of great importance and should be always be in great priority. We should all be with our best to save our mother land and most important humanity.