But if the temperature rises by above 2℃，impacts will be increasingly felt worldwide.The wealth of Europe and North America means they can build better defenses and suffer far fewer deaths，but economic costs will be huge.

　　A warmer climate will be bad news for global agriculture.Agronomists are busy designing new varieties of main crops like rice and wheat which are able to survive more frequent heat－waves and droughts.Organizations like the Consultative Group on International Agricultural Research helping farmers find out what works for them.Despite such efforts，crops will fail more often，probably leading to high food prices.

　　Cases of health problems ranging from heatstroke to infectious diseases will also increase.Models show tropical diseases will move into higher latitude(纬度)and altitude with warming，though some believe that affected regions with better public health systems will avoid the worst effects.

　　The degree of sea－level rise is a big uncertainty，but we know it lags_behind temperature increases so the worst of those consequences probably will not have kicked in even by 2080.Scientists are also split on the link between temperature and human conflict.Some believe civil unrest will rise as the climate becomes harsher.

　　1．The reason why the cyclone Sidr kill fewer people in Bangladesh in 2007 was that ________.

　　A．the temperature rose by 2℃

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