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Global warming refers to an average increase in the Earth's temperature, which in turn causes changes in climate. A warmer Earth may lead to changes in rainfall patterns

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Introduction

What is Global Warming? Global warming refers to an average increase in the Earth's temperature, which in turn causes changes in climate. A warmer Earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, their concern is about global warming caused by human activities. How is it caused? Scientists agree that the burning of fossil fuels like oil and coal cause greenhouse gases to escape into the air and that these gases are causing most of the warming. Another cause is deforestation (cutting down trees). Trees soak up carbon dioxide, one of the greenhouse gases, from the air. Why is it a bad thing? How can we reduce it in the future? People are doing many things to try to stop global warming. One thing people are doing is carpooling. Carpooling is driving with someone to a place that you are both going to. ...read more.

Middle

The glass used for a greenhouse works as a selective transmission medium for different spectral frequencies, and its effect is to trap energy within the greenhouse, which heats both the plants and the ground inside it. This warms the air near the ground, and this air is prevented from rising and flowing away, in addition to the fact that infrared radiation cannot pass through the greenhouse glass. How is it caused? Acid rain is caused by the release of the gases SO2 (sulphur dioxide) and NOX (nitrous oxides). The main sources of SO2 in South Africa are coal-fired power stations and metal working industries. The main sources of NOX emissions are vehicles and fuel combustion. Why is it a bad thing? The world is now hotter than it has ever been since scientists started recording temperature. As the world gets hotter there will be more droughts in Africa and America leading to shortages of food. The slightest rise in the average yearly temperatures causes the polar ice caps to melt. ...read more.

Conclusion

* Run the washing machine with a full load. * If using an automatic dishwasher, let the dishes air dry. * Hang dry some-or all-of the laundry. * Buy energy-efficient appliances. * Avoid the use of air conditioners altogether. * Turn out the lights in empty rooms and when away from home. * Consider installing compact fluorescent bulbs instead of high-wattage incandescent bulbs. * Turn off the hot water tank when going away for extended periods of time. * Install additional insulation on the hot water tank and pipes. * Insulate and draft-proof your basement. What's been done about it? In 1985 the governments of Canada and the seven eastern provinces joined forces to take action on reducing sulphur dioxide, the major contributor to acid rain. They launched a program to cut sulphur dioxide emissions in the eastern provinces in half by 1994. It was hoped that this action would reduce the deposition of sulphates in rain and snow in eastern Canada from levels as high as 40 kg per hectare per year (kg/ha/yr) to no more than 20 kg/ha/yr, a level that would cause considerably less damage to ecosystems. ...read more.

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