全球气候变暖的危害1（The harm of global warming 1）贵州师范大学学报
There are two reasons for global warming: a large amount of coal, natural gas and so on produce a large number of greenhouse gases; wanton deforestation of virgin forests, so that the ability to absorb carbon dioxide decreased.vhs录像机
The system of the atmosphere and the surface of the earth is like a giant "glass greenhouse" that keeps the surface temperature constant and produces an environment suitable for the survival of humans and other organisms. In this system, the atmosphere can not only let the solar radiation pass through the ground, but also prevent the loss of the ground radiation. The protective effect of the atmosphere on the ground is called the greenhouse effect of the atmosphere. Greenhouse gases are known as "greenhouse gases" that allow solar short wave radiation to pass freely and absorb long wave radiation from the earth's surface. These gases have carbon dioxide, methane, chlorofluorocarbons, ozone, nitrogen oxides and water vapor, among which carbon dioxide is the most important. The global climate has been warming up for the past 100 years, and meanwhile, the amount of greenhouse gases in the atmosphere has also increased dramatically. Many scientists believe that the greenhouse effect caused by a large amount of greenhouse gas emissions may be the underlying cause of global warming.
Human activities that emit greenhouse gases include all fossil fuels, burning activities, and carbon dioxide emissions. In the fossil energy, coal was the highest, followed by oil, natural gas is relatively low; coal gas leakage in mining process of fossil fuel emissions of carbon dioxide and methane; cement, lime, chemical and other industrial production process of
carbon dioxide emissions; paddy fields, cattle and other animal on anti digestion process of methane emissions from land use; changes to reduce the absorption of carbon dioxide and methane emissions; Nitrous Oxide.
Human combustion of coal, oil, natural gas and trees produces large amounts of carbon dioxide and methane, which heats up the earth after entering the atmosphere, causing carbon cycle imbalances, and changing the energy conversion forms of the earth's biosphere. Since the industrial revolution, the carbon dioxide content in the atmosphere has increased by 25%, far exceeding the historical record that scientists have been able to survey over the past 160 thousand years, and there is no sign of slowing down.
The main cause of global warming is that mankind has been using mineral fuels (such as coal, oil, etc.) for a century, emitting a large amount of carbon dioxide and other greenhouse gases. Because
these greenhouse gases on the radiation from the sun wave through a highly, highly absorbent on the earth longwave radiation reflected, it is often said that the "greenhouse effect", leading to global warming.
Forests in the world are divided into three types: boreal (boreal) forest, temperate forest and tropical forest. According to experts, today's forest ecosystem, is the nature of 8000 years of evolution is gradually formed.
Today, all the virgin forests have become targets for
large-scale exploitation of lumbering. In the tropics, many of the forests that have disappeared now have been cut off in the
past 50 years. Only from 1960 to 1990, there are more than 450 million hectares of tropical forest were swallowed, accounting for 20% of the total area of the world's tropical forests; there are millions of hectares of tropical deforestation, forest degradation in farmland reclamation and mineral exploitation.
Moreover, the global illegal logging and illegal timber products trading continues to increase, especia
lly in developing countries with tropical forests and Russia, which is poorly governed by the government. The demand for cheap wood products in the international market has further worsened the situation.
王庸晋The Intergovernmental Panel on climate change predicts that global temperatures will rise by about 1.4-5.8 degrees Celsius (2.5-10.4 degrees Fahrenheit) by 2100, according to climate models. According to this forecast, global temperatures will change dramatically over the past 10000 years, which has potentially significant implications for the global environment.
Harm
There are about 40 small island developing countries and territories around the world. They are faced with many unfavorable situations, including the lack of resources, the isolation of the economy, the degradation of land and marine environment, and the possible rise of sea level due to climate change.
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At the request of the summit on earth issues, the United Nations
held a global conference on sustainable development of small island developing States in Barbados
in 1994". The conference stressed the economic and ecological vulnerability of small island developing countries, and adopted an agenda (Barbados agenda for sustainable development of small island developing countries). The agenda sets out the policies, actions and measures that governments and the international community need to support the sustainable development of these small island developing states.
2012年江苏高考英语Zhang Piyuan, a researcher at the Institute of Geographic Sciences and natural resources, the Chinese Academy of Sciences, said: "global warming" has caused changes in the entire ecological environment. First of all, "global warming" lead to rising sea levels, rainfall redistribution, change the current world climate pattern; secondly, "global warming" destruction and influence of the chain and the food chain, causing more serious natural consequences. For example, there is a migratory bird who flies from Australia to Northeast China every summer. As the global warming increases the temperature in Northeast China and the summer is prolonged, the time of this bird leaving the Northeast becomes later, and the time to return to the Northeast will be delayed accordingly. As a result, a species of insect eaten by the migratory bird was flooded, destroying large tracts of forest. In addition, extreme events related to the environment, such as droughts, floods and so on, are increasing.
Political restrictions on carbon dioxide emissions limit the consumption of energy, and will have a restrictive impact on the world. "Emission reduction" in developing countries, or
"emission reduction" in developed countries has become the focus of discussion. As a developing country is a long body of children, need to consume energy to promote the growth of greenhouse gas emissions in developing countries continue to increase, in 2013 after the "emission reduction" problems will focus in developing countries. The scientific question of preventing global warming is bound to lead to the issue of "North-South relations", which has become an international political issue.
The distribution of climate precipitation has also changed. The mainland especially the increase of precipitation in the high latitude areas, less precipitation in some regions of Africa. The occurrence frequency and intensity of extreme weather and climate events (El Nino, drought, floods, thunderstorms, hail, storms, hot weather and dust storms) in some areas are increasing.
Ocean: as the global temperature rises, the amount of water vapor evaporated in the oceans has increased dramatically, exacerbating the warming phenomenon. The decrease of the total heat capacity of the oceans can also inhibit global warming. In addition, because the ocean releases excess CO2 into the atmosphere, the real culprit is the plankton community in the ocean.
cdn服务Impact of global warming on crop crop growth There are both advantages and disadvantages. First, the global temperature changes directly affect the global water cycle, causing droughts or floods in some areas, resulting in crop yield reduction, and the temperature is too high is not conducive to
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