The speech on global warming is about 800 words.

Global warming will bring complex potential impacts on the earth and human beings, both positive and negative.

Yes For example, with the increase of temperature, sub-polar regions may be more suitable for human habitation; Under the right conditions,

Higher carbon dioxide concentration can promote photosynthesis and make plants have higher carbon fixation rate, thus producing

The increase of plant growth, that is, the effect of increasing production of carbon dioxide, is a positive impact of global warming. But positive

Compared with the surface impact, the negative impact of global warming on human activities will be greater and far-reaching. In August this year, CCTV reported that the summit of Mount Qomolangma dropped by 1.3 meters due to climate warming.

Glacier shrinkage in Qilian Mountains endangers Hexi Corridor: In recent years, the melting of glaciers in Qilian Mountains has decreased by about 654.38 billion cubic meters compared with that in 1970s, and the snow line of glaciers in some areas is rising at an average annual rate of 2-2.6 meters. According to experts' analysis, in addition to natural climate factors, glacier retreat and snow line rise are mainly caused by population expansion, overload and overgrazing, over-reclamation, deforestation and indiscriminate exploitation of groundwater. China Environment News 2004-9- 16

1, the influence of sea level rise

In the past century, the sea level has risen by 14.4cm, and that of China by11.5cm.. The main reason for sea level rise is the thermal expansion of seawater. When the ocean warms, the sea level rises. Global warming will lead to the melting of icebergs in the north and south poles of the earth, which is also one of the main reasons for the rise of sea level. The direct impact of sea level rise has the following aspects:

The lowlands were flooded:

Britain heightens dams to cope with climate warming

Global warming makes the sea level rise and the frequency of storms increase, which makes it impossible for the British to raise flood control dams politically. Statistics released by British officials recently show that in the past 20 years, due to global warming, the Thames water level has risen, and local government agencies have to raise flood control dams 88 times to ensure the safety of Londoners' lives and property. It is reported that people now raise dams four times a year on average. It is estimated that before 2030, the frequency of heightening dams will reach 30 times a year. China Environment News 2004- 10- 19

(2) Coastal erosion

(3) The salt content of surface water and groundwater increases, which affects urban water supply.

(4) The groundwater level rises.

(5) Tourism is endangered (the sea level rises by 50m, the coastal tourist areas of Dalian, Qinhuangdao, Qingdao, Beihai and Sanya are 365 and 438+0-366 behind, the beaches are lost by 24%, and the beaches of Beidaihe are lost by 60%. China Land and Resources Bulletin reported in 2002 that coastal tourism has become the largest industry, with an output value of 250.3 billion yuan, accounting for 34.6% of the total output value of marine industry.

(6) Affect the life of coastal and island residents (accounting for13 of the world population) and make them threatened. If the polar ice sheet melts, economically developed and densely populated coastal areas will be swallowed up by seawater, and low-lying island countries such as Maldives and Seychelles will disappear from the ground, and coastal cities such as Shanghai, Venice, Hong Kong, Rio de Janeiro, Tokyo, Bangkok and new york, as well as Bangladesh, the Netherlands and Egypt will also be doomed.

2, the impact on animals and plants

Climate is the main factor that determines the distribution of biological communities. Climate change can change the adaptability of different species in a region and the competitiveness of different populations in the ecosystem. Animals and plants in nature, especially plant communities, may adapt to the speed of global warming, thus encountering bad luck. Past climate change (such as the ice age) has made many species disappear, and the future climate will make some species disappear in some areas.

Loss, although some species benefit from climate warming, their habitats may increase, competitors and

Natural enemies may also decrease. Take oranges as an example. In the 1970s, its northernmost boundary line was the Yellow River.

On the front line of this mountain, Xuancheng tried to plant it, but it was frozen to death by a heavy snow in winter. But now I'm

The orange trees in our campus are all growing well. For example, Chinese alligators only live in Xuancheng, Jingxian and Nanling.

On a small scale, if the northern boundary moves northward, the Chinese alligator may become extinct naturally. This is from some parts of our province.

Go ahead. Nationally, China regards the winter 1℃ isotherm as the northern boundary of subtropical zone, which is currently.

In the Qinling-Huaihe region of China. It is found that the rising temperature will move this boundary northward to the north of the Yellow River.

The winter temperatures in Guangzhou and Zhengzhou will be similar to those in Hangzhou and Wuhan now.

3. Impact on agriculture

The distribution of temperature and precipitation in a year is the main factor to decide what crops to plant. The change of temperature and precipitation caused by temperature will affect the yield of food crops and the distribution type of crops. Climate change leads to great changes in biota and its spatial (latitude) distribution. For example, in 800- 1200, the average temperature in the North Atlantic was 1℃ higher than it is now, which made it possible to grow corn in Norway. But by 1500- 1800, there was a little ice age in western Europe, and the average temperature was only 1-2℃ lower than it is now, which caused. In addition, global warming will aggravate natural disasters such as high temperature, heat wave, tropical storm and tornado. Therefore, after the global temperature rises, the stability and distribution of world grain production will change greatly.

4. Impact on human health

Human health depends on a good ecological environment, and global warming will become one of the problems of human health in the next century.

Main factors. Extreme high temperature will become a human health problem in the next century, becoming more frequent and common, mainly

Reflected in the increase of morbidity and mortality, especially malaria, lymphatic filariasis, schistosomiasis, hookworm disease,

Infectious diseases such as cholera, meningitis, kala-azar and dengue fever will endanger tropical regions and countries, some of which are mainly

Diseases that occur in tropical areas may spread to mid-latitudes with climate warming.

2017-11-28 is recommended.

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A speech on global warming

Speech on Global Warming/Question/42715383.htmlWhat are the hazards of global warming? Global Warming People around the world may feel that the climate has been getting warmer and warmer in recent years. In the past, snowy places often experienced snow-free winters. In some arid areas, the drought lasts longer. People find that in hot summer, they can hardly work or sleep without air conditioning. The side effects of global warming are worrying. Global warming melts the ice sheet, causing the sea level to rise. More importantly, it disturbs weather patterns, leading to droughts, severe storms and hurricanes. People have suffered many disasters related to global warming. In order to stop global warming, we should make sustained efforts immediately. We hope this situation will change soon. Global warming has aroused our concern, because it affects us and will affect our future generations. We can't wait any longer Do it. Do it well. Do it now.

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Global Warming English Speech

Global warming, since the industrial revolution, due to the increase of greenhouse gases, the temperature of the earth's lower atmosphere has gradually increased. The atmospheric temperature near the earth's surface is warmed by a natural process called greenhouse effect. Visible short-wave light shines from the sun to the earth and passes through a layer of hot gas or greenhouse gas mainly composed of water vapor, carbon dioxide, methane, nitrous oxide and ozone. Infrared radiation reflects from the surface of the planet into space, but it does not easily pass through the hot blanket. Part of it is captured and reflected downwards, keeping the average temperature of the earth suitable for life, about 60 degrees Fahrenheit (16 degrees Celsius). Since the industrial revolution, the development of industry, agriculture and transportation has produced a large number of natural greenhouse gases, which, together with chlorofluorocarbons and other gases, have expanded the thermal carpet. It is generally believed that the increase in the amount of greenhouse gases absorbs more heat and raises the global temperature, making a process beneficial to life potentially destructive and harmful. In the past century, the atmospheric temperature rose by 1. 1 Fahrenheit (0.6 degrees Celsius) and the sea level rose by several inches. Some expected long-term results of global warming include melting polar ice, leading to sea level rise and coastal floods; The supply of drinking water that depends on the melting of snow is interrupted; The profound changes brought by climate change to agriculture; With the disappearance of niche, species become extinct; More frequent tropical storms; And an increase in the incidence of tropical diseases. Factors that may lead to global warming include the burning of coal and petroleum products (sources of carbon dioxide, methane, nitrous oxide and ozone); Deforestation has increased the content of carbon dioxide in the atmosphere; Methane gas released from animal excrement; And increasing the number of cattle, which leads to deforestation, methane production and the use of fossil fuels. Many debates around global warming focus on the accuracy of scientific prediction of future warming. In order to predict the global climate trend, climatologists have accumulated a large number of historical databases and used them to create computerized models to simulate the global climate. The validity of socio-economic model has always been a controversial topic. Skeptics say that the climate is too complex to model accurately, and there are too many unknown factors. Some people also question whether the observed climate change only represents the normal fluctuation of global temperature. Nevertheless, for some time, it has been generally believed that at least some of the observed warming is the result of human activities, and this problem needs to be solved. 1992, at the United Nations Conference on Environment and Development, more than 150 countries signed a binding declaration to slow down global warming. However, in 1994, the United Nations scientific advisory panel, the Intergovernmental Panel on Climate Change, concluded that in order to avoid global warming, it is necessary to reduce emissions beyond those envisaged in the treaty. In the second year, the advisory group predicted that if no action is taken to reduce the production of greenhouse gases, the global temperature will rise from 1.44 to 6.3 degrees Fahrenheit (0.8-3.5 degrees Celsius) by 2 100, and even if action is taken, the temperature will rise from 1 to 3.6 degrees Fahrenheit (0.5-2). 1997 The United Nations Climate Change Conference held in Kyoto, Japan reached an international agreement to combat global warming, which called on industrialized countries to reduce greenhouse gas emissions. However, not all industrialized countries immediately signed or ratified the agreement. 200 1 Bush administration renounces Kyoto Protocol; Because the United States produces a quarter of the world's greenhouse gases, this is considered to be a serious blow to efforts to slow down global warming. Despite the action taken by the United States, most other countries reached an agreement on the necessary details of transforming the agreement into a binding international treaty later that year (in Bonn, Germany and Marrakech, Morocco), which came into force in 2005 after being ratified by 125 countries. Increasing vehicle mileage, reforestation projects, building energy conservation and state support for public transportation are all relatively simple adjustments that can significantly reduce greenhouse gas emissions in the United States. More active adjustments include phasing out the use of fossil fuels worldwide, eliminating chlorofluorocarbons, and slowing down deforestation by adjusting the economic structure of developing countries. In 2002, the Bush administration proposed several voluntary measures to slow down rather than reduce greenhouse gas emissions.

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The lecture on global warming takes about 3-5 minutes.

The main reasons that affect global warming are 1 industrial waste gas (CO2), urban heat island effect, ozone hole enlargement, ultraviolet enhancement, deforestation, recycling destruction and so on. The outline has been right for a long time, so start answering.

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The speech on global warming is about 800 words-to find the answer, let's "ask questions"

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A speech on global warming. (Speech-)

If this continues, the global climate will be two-tiered and unstable, a large number of climate refugees will flee everywhere, agriculture will become more and more tense, the competition for resources will become more and more fierce, and the possibility of conflict will become more and more serious ... The only way is to reduce emissions now and control the global average increase within 2 degrees Celsius. Just like this, the above situation may also happen. If the rise is higher than the bottom line, it is estimated that there will be a situation of 20 12 ... However, when the situation starts to deteriorate, it will trigger a chain reaction ... it is likely that there will be new inventions or new technical solutions. This is the reason for the emergence of geophysics ... However, this solution may bring more serious consequences ... just like the destruction of nature by the industrial revolution in the past ... I think the best way is an energy revolution, with solar energy as the main energy source, followed by clean and large amounts of electricity, which will produce hydrogen. Using hydrogen as fuel, the whole problem will be solved. Attached is my opinion on solar energy application in China, which is selected from my blog: 2 1 century should be the century of solar energy (2010-02-1406: 59:11). Reprinted label: environmental protection solar power supply system solar energy system. With global warming and energy shortage, it is becoming more and more important to develop and apply new green energy. I have my own views on this issue, which are detailed as follows. I think among many green energy sources, solar energy has the most potential and application value. In Britain, there is a company called Solar Century. They think that solar energy can completely replace the position of oil in this century, so it is called the solar century. At present, many houses in Britain have installed solar panels, and the government has subsidies to make users self-sufficient in electricity, and the surplus can be sold back to power generation companies. After more than 20 years, you can recover the money you bought for solar panels. In this way, installing a civil solar energy system has become a good long-term investment, which is quite fashionable in this era. Japan's development has been in the foreseeable future. The Japanese also pay great attention to this aspect. Because Japanese cars have been working hard on environmental protection for a long time, Japanese cars have sold well in foreign markets as a result. The Japanese government provides subsidies for the large-scale installation of civil solar power generation system in China. I think the function and significance of solar power generation is a bit like photosynthesis of plants. There is a company in Britain called Sun Century. They think that 2 1 century is the century of solar energy. Their most important thing is to develop civil solar power supply system. According to their website, it is said that the electricity generated by the solar energy system can completely make users self-sufficient, and it may be sold back to the power company. In this way, solar energy has become a long-term investment. I think China is most likely to realize the potential of large-scale application of solar energy, because the biggest obstacle to solar energy now is the price.