Essay on Global warming for 11th class
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Answer:
Essay On Global Warming in 300 Words
Global warming is a phenomenon where the earth’s average temperature rises due to increased amounts of greenhouse gases. Greenhouse gases such as carbon dioxide, methane and ozone trap the incoming radiation from the sun. This effect creates a natural “blanket” which prevents the heat from escaping back into the atmosphere. This effect is called a greenhouse effect.
Contrary to popular belief, greenhouse gases are not inherently bad. In fact, the greenhouse effect is quite important for life on earth. Without this effect, the sun’s radiation would be reflected back into the atmosphere, freezing the surface and making life impossible. However, when greenhouse gasses in excess amounts get trapped, serious repercussions begin to appear. The polar ice caps begin to melt, leading to the rise in sea levels. Furthermore, the greenhouse effect is accelerated when polar ice caps and sea ice melts. This is due to the fact the ice reflects 50% to 70% of the sun’s rays back into space; but without ice, the solar radiation gets absorbed. Seawater reflects only 6% of the sun’s radiation back into space. What’s more frightening is the fact that the poles contain large amounts of carbon dioxide trapped within the ice. If this ice melts, it will significantly contribute to global warming.
A related scenario when this phenomenon goes out of control is the runaway-greenhouse effect. This scenario is essentially similar to an apocalypse, but it is all too real. Though this has never happened in the earth’s entire history, it is speculated to have occurred on Venus. Millions of years ago, Venus was thought to have an atmosphere similar to the Earth’s. But due to the runaway greenhouse effect, surface temperatures around the planet began rising.
If this occurs on earth, the runaway greenhouse effect will lead to many unpleasant scenarios – temperatures will rise hot enough for oceans to evaporate. Once the oceans evaporate, the rocks will start to sublimate under the heat. To prevent such a scenario, proper measures have to be taken to stop climate change.
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Answer:
Global Warming
Global warming is the phenomenon of the increase in the temperature of the atmosphere due to the presence of excessive greenhouse gases emitted mostly by the burning of fossil fuels.
Effects of global warming:
Global warming will results in the melting of the polar ice caps and raise the ocean level which will submerge islands and coastal lands. Some of the fastest sinking cities are Tianjin in China, Semarang in Indonesia, Jakarta in Indonesia,
Shanghai in China, Ho Chi Minh City in Vietnam, Hanoi in Vietnam, Chittagong in Bangladesh, and Kobe in Japan.
Island nations which will be submerged first by the rising sea level are the Maldives, Solomon Islands, Samoa, Fiji Islands, etc.
Due to extreme climatic conditions, millions of people will be displaced. There will cause a serious refugee problem as people migrate to other countries looking for resettlement. Cities in the US New Orleans, Louisiana, Miami, and Florida are being affected by extreme weather conditions due to climate change.
Global warming would cause unpredictable rainfall. A sudden flash flood will be followed by a long period of drought. This will cause scarcity of drinking water and irrigation for cultivation leading to worldwide food scarcity.
The burning of fossil fuels increases global warming and also depletes the ozone layer which protects us from the harmful effects of UV rays of the Sun. This will increase the cases of skin cancer.
Global warming would cause unpredictable rainfall. A sudden flash flood will be followed by a period of a long drought. This will cause a scarcity of drinking water. The shortage of water for irrigation will lead to the failure of agriculture and cause worldwide food scarcity.
Prevention of Global Warming:
The catastrophic consequences of Global Warming can be mitigated by preserving the natural ecological system, shifting to sustainable development, and using more environmentally friendly energy.
Planting more trees will reduce the amount of harmful carbon dioxide gas in the atmosphere and reduce global warming. We need to shift to alternative energy instead of burning fossil fuels like coal and petroleum products. The burning of fossil fuels increases global warming and also depletes the ozone layer which protects us from the harmful effects of UV rays of the Sun.
The increase of harmful greenhouse gases will also result in acid rain. The acid rain will kill marine life and corrode buildings and historical monuments.
Industrial waste must be treated properly before they are dumped. Using renewable energy like hydroelectricity and solar energy will help us to reduce global warming. Urgent steps must be taken to reduce exhaust emissions from motor vehicles, power plants, factories, and industries. Global warming needs urgent global actions for the survival of life on earth, our home planet.
By: Selie Visa