改变世界的温度——全球变暖
最近这几年，大家觉得天气一下子就变热了，原本凉爽的秋天现在几乎要到10月上旬才开始，8月份最热的天居然达到了40度以上。这些与平常不一样的异象，都是人类自己造成的的祸。
如今，“全球变暖”一词已经逐渐渗透到我们生活中来。这个词听起来很学术，甚至会觉得离我们很遥远，所以有些人对此不以为然。其实，全球变暖的影响已经超乎我们想象：全球降水量重新分配、冰川和冻土消融、海平面上升等等。既危害自然生态系统的平衡，更威胁到了人类的食物供应和居住环境。
既然已经意识到全球变暖的危害，就应该去预测并改善它。想象一下，如果21世纪全球变暖加剧，全球平均气温逐步上升，那么，下一场超级风暴，下一轮灼人热浪，下一场重大天灾将降临何处？中国？美国？日本？没人知道。争论已经落幕。全世界的科学家们一致指出：地球的平均气温确实已升高将近1℃。由于各地出现的预警信息，人类利用数千艘船只，数万所陆上监测站，以及外太空的卫星，共同对地球进行监控。科学家们将获得的数据输入最先进的计算机模型，以此估算地球可能面临的未来。
预测结果令人担忧。四十年后，喜马拉雅山区的冰河，这个数百万人赖以生存的水源很有可能消失。格陵兰冰层可能在50年内全部融化。目前，亚马逊雨林的生物品种占全世界的一半，但这座雨林很可能在本世纪末变成一片不毛之地。未来的世界就有可能像电影《后天》里的一样，龙卷风，冰层断裂，温度急剧下降，冰风暴，冻雨，地震，洪水，海啸，火山爆发……这并不是疯狂的幻想，如果人类不停止毁坏环境的话，这将成为现实！
不过，全区变暖也有益处。全球变暖在黑龙江水稻的种植上，发挥了很大的作用。对位于寒冷地区的粮食种植来说，升高温度，就意味着更多的热量，更长的生长期，而这些因素都可以促进水稻生长发育，提高产量。
只是，全球变暖对人类未来发展仍是“弊大于利”。 为了拯救地球，我们应该尽量做到：不开空调，使用回收环保纸张，舍弃含有一氧化二氮的肉类食品，不用塑料袋，乘公交车……生活中的点点滴滴。其实环保并不难，只要你支持环保，就是你给这个星球的最好礼物。
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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 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 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?
The answer is simpler than you may think. You don¡¯t have to go miles away from home to protest, or spend masses of money. If you try to follow the few simple 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 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?
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, 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.