问答题 Water is the giver and, at the same time, the taker of life.It covers most of the surface of the planet we live on and features large in the development of the human race.On present predictions, it is a statement that is set to assume even greater significance. Throughout history, water has had a huge impact on our lives.Humankind has always had a rather ambiguous relationship with water, on the one hand receiving enormous benefit from it, not just as a drinking source, but as a provider of food and a means whereby to travel and to trade.But forced to live close to water in order to survive and to develop, the relationship has not always been peaceful or beneficial.In fact, it has been quite the contrary.What has essentially been a necessity for survival was turned out in many instances to have a very destructive and life-threatening side.
【正确答案】Planting trees.
【答案解析】文章第六段第三句提到,植树是一种更便宜、 更有吸引力的解决方案。由此可知本题答案。