全球变暖英语演讲稿500字

1全球变暖英语演讲稿

global warming the gradual increase of the temperature of the earth's lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution.

The temperature of the atmosphere near the earth's surface is warmed through a natural process called the greenhouse effect. Visible shortwave light comes from the sun to the earth passing unimpeded through a blanket of thermal or greenhouse gases composed largely of water vapor carbon dioxide methane nitrous oxide and ozone. Infrared radiation reflects off the planet's surface toward space but does not easily pass through the thermal blanket. Some of it is trapped and reflected downward keeping the planet at an average temperature suitable to life about 60°F (16°C).

Growth in industry agriculture and transportation since the Industrial Revolution has produced additional quantities of the natural greenhouse gases plus chlorofluorocarbons and other gases augmenting the thermal blanket. It is generally accepted that this increase in the quantity of greenhouse gases is trapping more heat and increasing global temperatures making a process that has been beneficial to life potentially disruptive and harmful. During the past century the atmospheric temperature has risen 1.1°F (0.6°C) and sea level has risen several inches. Some projected longer-term results of global warming include melting of polar ice with a resulting rise in sea level and coastal flooding; disruption of drinking water supplies dependent on snow melts; profound changes in agriculture due to climate change; extinction of species as ecological niches disappear; more frequent tropical storms; and an increased incidence of tropical diseases.

Improved automobile mileage reforestation projects energy efficiency in construction and national support for mass transit are among relatively simpler adjustments that could significantly lower U.S. production of greenhouse gases. More aggressive adjustments include a gradual worldwide shift away from the use of fossil fuels the elimination of chlorofluorocarbons and the slowing of deforestation by restructuring the economies of developing nations. In 20XX the Bush administration proposed several voluntary measures for slowing the increase in instead of reducing emissions of greenhouses gases.

2全球变暖英语演讲稿

In recent years do you think the weather suddenly turned hot had the cool autumn now almost until early October the hottest day in August has reached more than 40 degrees. These is different from normal vision we have ourselves to blame the curse.

Today the term "global warming" has gradually penetrated into our life. The word sounds very academic even feel very far away from us so some people are not. In fact the effects of global warming is beyond our imagination: global precipitation redistribution glaciers and permafrost melt rising sea levels and so on. Both harm the natural ecosystem balance more threatening human food supply and living environment.

Now that you have aware of the dangers of global warming you should go to predict and improve it. Imagine if global warming is melting in the 21st century the global average temperature rising gradually so the next super storms the next round of searing heat the next major natural disasters will happen? China? The United States? Japan? No one knows. The debate has ended. Scientists around the world agree points out that the earth's average temperature has increased nearly 1 ℃. Due to all the early warning information human use of thousands of ships tens of thousands of the monitoring stations of the land and outer space satellite to monitor the earth together. Scientists will have the most advanced computer data input model to estimate the earth can face the future. Prediction results are worrying. Forty years later the Himalayan glaciers the water to the survival of millions of people are likely to disappear. The Greenland ice sheet could melt in 50 years. Currently half of the world's biodiversity in the amazon rainforest but the rainforest is likely to turn into a piece of barren land by the end of the century. Is likely to be the future of the world like in the movie "the day after tomorrow" tornado ice fracture the temperature fell sharply ice storms freezing rain earthquake flood tsunami volcanic eruption... This is not a crazy fantasy if humans don't stop destroying the environment it will become a reality!

However in the warming is also good. Global warming on rice in heilongjiang province has played a large role.

Just global warming to human future development is still the do more harm than good.

In order to save the planet we should try to be: don't open air conditioning use recycled paper environmental protection to leave the meat with nitrous oxide don't use plastic bags R22 by bus; R22; Little drops of life. Actually it's not difficult to environmental protection as long as you support environmental protection is the best gift you gave the planet.

Thank you all!

3全球变暖英语演讲稿

There is little doubt that the planet is warming. Over the last century the planets temperature has risen by around 1 degree fahrenheit (0.6 of a degree celsius). The warmest since the mid 1800’s was the 20xXs. The hottest years recorded were 20XX 20XX 20XX 20XX 20XX.

The United Nations panel on climate change projects that the global temperatures will rise 3-10 degrees fahrenheit by the century’s end - enough to have the polar caps all but melted. If the ice caps melt a vast majority of our countries borders will be under water. Monuments and great buildings as well as homes and lives will be under water including New York City.

So now we know what some of the causes are for global warming how can we as individuals do our part to help save the planet?

Firstly plant a tree. This could be easier than it sounds. Join or help out a local wildlife group and ask to plant a tree. Trees when fully grown will help keep the planet cooler. On the same point you could protest against the demolition of the rainforests. This is the same principle we need the trees to cool our planet and yet they are chopping them down to create roads or homes.

Something as simple as walking instead of taking the car will help reduce pollution. As well as stopping pollution you are giving yourself exercise something important for our bodies. So the next time you get into your car or your motorbike think - do I have to make this journey by vehicle or can I walk?

If possible buy your fruit and vegetables from local suppliers. And try to avoid imported goods. The more foreign food that we import the more pollution from aeroplanes and boats it will create.

Keeping to the speed limit can also help the environment. The more you speed the more petrol you are going to use making the pollution higher. Also SUV’s make about six times their own weight in CO2 each year. A small efficient diesel car covering the same distance not only uses much less fuel; it makes two thirds less.

If possible use solar energy after all it is free; all you need to buy is the equipment. You can get much of your hot water and heating from the sun and even generate electricity.

Reduce reuse and recycle. Only buy what you need; don’t stock the cupboards with things you may or may not use. Reuse whatever you can like containers and paper and recycle what you cannot reuse. It really is as simple as that.

Finally turning off unused sources of power such as televisions and heaters will help the environment as well as save you money.

If everybody stuck to these rules we would be doing a great thing by protecting the earth. So please take into consideration what I have said and try to do your part. After all it will be our next generation that will feel the effects.