溫室效應(yīng)英語演講稿
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 1800s was the 1990s. The hottest years recorded were 1997, 1998, 2001, 2002, 2003.
The United Nations panel on climate change projects that the global temperatures will rise 3-10 degrees fahrenheit by the centurys 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?
The answer is si-mp-ler than you may think. You dont have to go miles away from home to protest, or spend masses of money. If you try to follow the few si-mp-le steps that I shall now give you, you will have started to help us all.
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 si-mp-le 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?
When you are at home, and your getting a little cold. Put a jumper on and do not adjust the heating. The extra heat produced by our homes also affects the planet. So try wearing an extra layer in winter.
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, ma-ki-ng the pollution higher. Also, SUVs 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; dont stock the cupboards with things you may or may not use. Reuse whatever you can, like containers and pa-pe-r, and recycle what you cannot reuse. It really is as si-mp-le 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.
溫室效應(yīng)英語演講稿 [篇2]
according to the national academy of sciences, the earth's surf-ace temperature has risen by about 1 degree fahrenheit in the past century, with accelerated warming during the past two decades. there is new and stronger evidence that most of the warming over the last 50 years is attributable to human #url#
human activities have altered the chemical composition of the atmosphere through the buildup of greenhouse gases – primarily carbon dioxide, methane, and nitrous oxide. the heat-trapping property of these gases is undisputed although uncertainties exist about exactly how earth’s climate responds to them.
energy from the sun drives the earth's weather and climate, and heats the earth's surf-ace; in turn, the earth radiates energy back into space. atmospheric greenhouse gases, such as water vapor, carbon dioxide, trap some of the outgoing energy, retaining heat somewhat like the glass panels of a greenhouse.
without this natural "greenhouse effect," temperatures would be much lower than they are now, and life as known today would not be possible. instead, thanks to greenhouse gases, the earth's average temperature is a more hospitable 60°#url#
however, problems may arise when the atmospheric concentration of greenhouse gases increases. once, all climate changes occurred naturally. however, during the industrial revolution, we began altering our climate and environment through changing agricultural and industrial practices.
before the industrial revolution, human activity released very few gases into the atmosphere, but now through population growth, fossil fuel burning, and deforestation, we are affecting the mixture of gases in the atmosphere.
carbon dioxide is released to the atmosphere when solid waste, fossil fuel and wood products are burned. methane is emitted during the production and transport of coal, natural gas, and oil. methane emissions also result from the decomposition of organic wastes in municipal solid waste landfills, and the raising of livestock. nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of solid waste and fossil fuels.
rising global temperatures are expected to raise sea level, and change precipitation and other local climate conditions. changing regional climate could alter forests, crop yields, and water supplies. it could also affect human health, animals, and many types of ecosystems and deserts may expand into existing rangelands. unless we act now, our children will inherit a hotter world, dirtier air and water, more severe floods and droughts, and more wildfires.
but solutions are in sight. we know where most heat-trapping gases come from: power plants and vehicles. and we know how to curb their emissions: modern technologies and stronger laws. by shifting the perception of global warming from abstract threat to pressing reality, and promoting online activism. by pressing businesses to use less energy and build more efficient products. and by fighting for laws that will speed these advances.
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