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  3. In last week’ s Science, a group of leading investigators led by John Beddington, the chief science adviser for the British gove

In last week’ s Science, a group of leading investigators led by John Beddington, the chief science adviser for the British gove

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问题     In last week’ s Science, a group of leading investigators led by John Beddington, the chief science adviser for the British government, published a call warning climate change has become a growing threat to agricultural production and food security. In other words, the potential risks to fanning are another reason why we need to reduce the carbon in the air. And the fact that the climate is already changing, and will continue to change, means that we also need to start adapting agriculture to a warmer world immediately.
    How exactly could climate change lower our ability to feed ourselves? Warming alone could do it, with already hot and dry places—like the American Southwest or the Horn of Africa—predicted to become hotter and drier. The terrible droughts that have affected Texas and East Africa lead to an extreme shortage of food in the latter case. While additional carbon in the air may help some plants, warmer temper temperatures can also slow down growth, so extreme heat could lead to greater crop loss.
    It’s not just drought, though; rain at the wrong time can be extremely bad for agriculture as well. That was obvious during the great floods in Pakistan in 2010, which not only killed thousands of people but also washed away crops. Those losses helped drive food prices to record highs during the past year, a level from which they’re only now beginning to drop. As the atmosphere warms, it can hold more water, which means we can expect heavier storms when the rain does fall.
    Warming isn’t the only threat to our ability to feed ourselves. It acts together with rising population and other factors. That’ s why scientists ate calling for more joint research as the first step to adapting agriculture to climate change. "The window of opportunity to prevent a climate crisis is rapidly closing, and we need better information and tools to balance how we grow our food and use our resources, " says Molly Jahn, dean of College of Agricultural and Life Sciences, University of Wisconsin. If we hope to live well in a warmer world, we have no other choice.  
This passage is mainly about_____.
选项 A、the technology of farming
B、the rise of food prices
C、the threat of climate change
D、the growth of population
答案C
解析
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