owadays the greenhouse gases absorb sunlight and infrared radiation which produces heat and it increases continuously. In principle, the temperature of the earth also increases. And this is so-called "Green House Effect". p> At present, the concentration of carbon dioxide doubles that before the Industrial Revolution. And the global temperature has increased about 1.5 ~ 3.5 Вў J. Human beings have altered the composition of the atmosphere. Coal-burning factories and motorcycles release more carbon dioxide into the atmosphere than oceans and forests can absorb. Consequently, the carbon dioxide content of the atmosphere could double the present level within the next fifty years.
People may ask: "Is it a serious problem? "My answer is:" Yes! "The global warming can effect us in many aspects, first of all, the level of the oceans has risen. A rise of sea level may accompany global warming, possibly in the range of 0 to 60 cm. The part of some land will be covered. Strictly speaking, some islands may disappear quietly and without leaving a trace. In addition, the global warming causes crisis to the ecosystem and agriculture. Some animals and plants suffer a lot of difficulties due to the global warming. To sum up, the greenhouse effect not only affects human lives but also causes pecuniary loss.
The global warming affects our human daily lives. And we must find the strategies to decrease the effect, which are caused by global warming. Indeed, human being have caused a lot of harm to nature, but the final victims who will be badly hurt will also be humans themselves.
The centrally "Planned" economies produce the most greenhouse gases per unit of economic output. The United States-with the largest transportation needs of any nation-produces approximately one-third, or 1.0 metric ton/$ 1,000 GNP, of the centrally planned output of CO 2 . All of the nations that produce less than the United States are smaller geographically. Japan, often cited for its efficiency, is second from the bottom of the table, but almost all its citizens live near each other, and the country is highly nuclear. France, the cleanest of all, is also the most nuclear and emits .34 metric ton of CO 2 /$ 1,000 GNP [6]. h1> Water pollution
Water pollution occurs mostly when people overload the water environment with wastes. It's defined as contamination of streams, lakes, underground water, bays or oceans by substances harmful to living things. p> Water is necessary to life on earth. All organisms contain it, some drink it, some live in it. Plants and animals require water that is moderately pure, and they cannot survive if their water is loaded with toxic chemicals or harmful microorganisms. If severe, water pollution can kill large numbers of fish, birds, and other animals, in some cases killing all members of a species in an affected area. p> Pollution makes streams, lakes, and coastal wate...
