70% of the earth's surface is covered by water.However，only 3% of the water is fit for human use，and the rest is frozen or salty.According to a report by WWF，water shortage（短缺） influences nearly 27% of the world's population.
    Many reasons cause water shortage.The first is climate（氣候）change.The heat caused by climate change leads to water drying out.The next is water pollution，which makes the limited water unsafe for using.What's more，the growing population makes the situation worse.In the last 50 years，the human population has more than doubled，and today 41% of world's population is badly in need of water.
    So，what are the results of water shortage？Firstly，people lack enough water to drink，which does harm to their lives and health.Besides，water shortage brings about hunger.Plants can not grow when there is not enough water.As a result，there is less food for people.
    Therefore，it's time to take action.Here are three ways for us to save water in daily life.First，take shorter showers.Save a minute or two of your shower time.Millions of people doing even the little things makes a difference.Second，check your taps（水龍頭）.If you forget to turn off a tap，all those wasted drops add up—sometimes 5 300 litres of water a year.Third，reuse water.Collect water after washing vegetables and pour it on your plants.

water shortage	reasons	（3） climate change climate change
		（4） water pollution water pollution
		growing population
	（1） results results	lacking drinking water
		hunger
	（2） actions actions	take shorter showers
		check your taps
		（5） reuse water reuse water