[单项选择]Climate change might force changes in diets around the world as certain staple foods become harder to produce, according to international agriculture researchers. However, future shortfalls could be offset by switching to crops which can thrive in those altered climates, according to new reports by the Consultative Group on International Agriculture Research.
Important crops like maize and wheat produce less grain at temperatures above 30 degrees Celsius."Those kinds of temperatures are being reached on a regular basis and more frequently in many countries now," says Sonja Vermeulen, head of CGIAR climate change research. Vermeulen says growing-season temperatures are not the only factors affected by climate change. Rainfall patterns are shifting, too. Water supplies will be strained in some areas, while others will see more floods.
Climate change is also altering habitats for pests and diseases, she says."And for some crops, particularly crops we really value, such as potato
A. won’t take effect in 100 years.
B. causes hard threat to global trade.
C. will cause large scale migration.
D. could force people to alter their eating habits.

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