阅读下面的短文，并从下面的文本框中为本文选择恰当的段落大意。
? Sports can help you keep fit and get in touch with nature. However, whether you are on the mountains, in the rivers, or on the grassland, you should know that your sport of choice might have great influence on the environment.
② Some sports are resource-hungry. Golf, as you may know, eats up not only large areas of countryside, but also tons of water. Besides, all kinds of harmful things and a lot of energy are used to keep its courses(球场)，This leads to serious environmental problems. For example, in Portugal and Spain, golf is considered to be the most important reason for water shortage(短缺）io some areas.
③ There are many environment-friendly sports. Power walking is one of them that you could do today. You don’t need anything special but a good pair of shoes; and you don’t have to worry about nature and your money. Simple and free, power walking -can also keep you fit. If you often walk, it will be good for your heart and bones.
④Nowadays more and more people choose to play "green sports". They play sports outdoors, in the countryside or other open spaces. There is no special things needed. And best of all, it’s free.
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，作者是美国作家 。(2分)