单项选择题

The shorter growing seasons expected with climate change over the next 40 years will endanger hundreds of millions of already poor people in the global tropics, say researchers working__62__ the world’s leading agricultural organizations. The effects of climate change are likely to be seen across the entire tropical__63__but many areas previously considered to be__64__food secure are likely to become highly__65__droughts, extreme weather and higher temperatures, say the__66__with the Consultative Group on International Agricultural Research. Intensively farmed areas __67__northeast Brazil and Mexico are likely to see their__68__growing seasons fall below 120 days, which is__69__for crops such as corn to mature. Many other places in Latin America are likely to __70__temperatures that are too hot for bean__71__a staple in the region. The impact could be__72__most in India and southeast Asia. More than 300 million people in south Asia are likely to be affected even with a 5% decrease in the __73__ of the growing season. Higher peak temperatures are also expected to take a heavy __74__ on food producers. Today there are 56 million crop-dependent people in parts of west Africa and India who live in areas where, in 40 years, maximum daily temperatures could be higher than 30 C. This is__75__to the maximum temperature that beans can tolerate, __76__ corn and rice yields suffer when temperatures__77__this level. ’We are starting to see much more clearly__78__ the effects of climate change on agriculture could__79__ hunger and poverty," said research leader Patti Kristjanson" Farmers already adapt__80__variable weather by changing their planting schedules. What this study suggests is that the speed of climate__81__and the magnitude of the changes required to adapt could be much greater."

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