Questions 61 to 65 are based on the following passage.
A bull grazes on dry wheat husks(Phi) in Logan, Kansas, one of the regions hit by the record drought that has affected more than half of the U. S. and is expected to drive up food prices.
Leadinu water scientists have issued one of the sternest warnings yet about global food supplies, saying that the worlds population may have to switch almost completely to a vegetarian diet over the next 40 years to avoid catastrophic shortages.
Adopting a vegetarian diet is one option to increase the amount of water available to grow more food in an increasingly climate-unstable world, the scientists said. Animal protein-rich food consumes 5 to 10 times more water than a vegetarian diet. One third of the worlds arable(适于耕种的) land is used to grow crops to feed animals. Other options to feed people include eliminating waste and increasing trade between countries in food surplus and those in deficit.
900 million people already go hungry and 2 billion people are malnourished in spite of the fact that per capita food production continues to increase, they said. With 70% of all available water being in agriculture, growing more food to feed an additional 2 billion people by 2050 will place greater pressure on available water and land.
The report is being released at the start of the annual world water conference in Stockholm, Sweden, where 2,500 politicians, UN bodies, non-governmental groups and researchers from 120 countries meet to address global water supply problems.
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