Countries must learn to share water fairly if they are to prevent warring over water as population growth and climate change make it ever more scarce. Farming uses 70 percent of the fresh water taken from the world's lakes and rivers and need from farms is set to increase by 14 percent in the next 30 years. Water conflicts can happen in water-stressed areas among local communities and between countries. The lack of instruments for water sharing  _ already difficult conditions. In the absence of clear rules, things will not be organized or arranged in order and power plays an important role. While humans drink between 2 and 5 litres of water a day, it takes 1,000-2,000 litres to produce a kilogram of wheat and up to 15,000 litres to produce a kilo of grain-fed beef. The daily consumption of water per person is a thousand times more than the consumption through drinking. Already 1.1 billion people lack clean water and, with the world's population set to grow from 6.5 billion to 8 billion by 2025, 1.8 billion people will face water scarcity by then. Global warming will exacerbate the problem, especially in poor, dry areas. To improve cross-border cooperation on water use, the 10 countries on the Nile are negotiating   a water-sharing agreement which the Food and Agriculture Organisation  hopes will be a model for other areas where the scarce water can be shared out peacefully. Which of the following may be the reason for water conflicts?
The lack of clear rules. That farming consumes too much water. That too much water has been wasted. Environmental pollution.
Question: Countries must learn to share water fairly if they are to prevent warring over water as population growth and climate change make it ever more scarce. Farming uses 70 percent of the fresh water taken from the world's lakes and rivers and need from farms is set to increase by 14 percent in the next 30 years. Water conflicts can happen in water-stressed areas among local communities and between countries. The lack of instruments for water sharing  _ already difficult conditions. In the absence of clear rules, things will not be organized or arranged in order and power plays an important role. While humans drink between 2 and 5 litres of water a day, it takes 1,000-2,000 litres to produce a kilogram of wheat and up to 15,000 litres to produce a kilo of grain-fed beef. The daily consumption of water per person is a thousand times more than the consumption through drinking. Already 1.1 billion people lack clean water and, with the world's population set to grow from 6.5 billion to 8 billion by 2025, 1.8 billion people will face water scarcity by then. Global warming will exacerbate the problem, especially in poor, dry areas. To improve cross-border cooperation on water use, the 10 countries on the Nile are negotiating   a water-sharing agreement which the Food and Agriculture Organisation  hopes will be a model for other areas where the scarce water can be shared out peacefully. Which of the following may be the reason for water conflicts?
A. The lack of clear rules.
B. That farming consumes too much water.
C. That too much water has been wasted.
D. Environmental pollution.
Answer: