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"We only have one earth" is a very famous slogan in Taiwan society. Not only does it remind us of the importance of environmental protection, but also encourage us to take actions. With the development of technology, human beings possess a better living than before. We have cars, cellular phones, various foods, and many other new products to enrich our current life. However, do we consider the impact we made on our surroundings? For example, human destroy the habitat of wild animals for the sake of building houses. Also, we manufacture many cars or other means of transport that generate too much carbon dioxide. Are we right? 

According to the statistics from newspaper, greenhouse effect is becoming more serious than past decades. The iceberg is melting sooner year by year. Without enough space and food resource, polar bears are forced to swim four times the previous distance to seize their games. The additional water also increases the altitudes of sea level and would probably even drown some small islands. 

Besides, the greenhouse effect influences our climate and makes the Earth warmer and warmer. Sometimes, this kind of climate change causes strange weathers. For instance, we don’t have snow in winter in Japan. The temperature in Greece in September is higher than 45 Celsius degrees. In Taiwan, although we don’t have any abnormal natural phenomenon due to the climate change, we can still feel that the four seasons seem to have disappeared; winter is not as cold as before. 

I believe that the Earth is being harmed by human activity. The effects are more obvious these years. The new Nobel Peace Prize Laureate, Al Gore, played an important role on these issues. His movie, An Inconvenient Truth, which is describes the crisis of climate change, is widely shown in different countries. As I mentioned in the beginning, we only have one earth, so everyone should face the problem and try to solve it from now on. Then, the dream of sustainable development will come true.
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