Climate change that researchers explored included temperature as well as rainfall - from very low rainfall and drought conditions to extreme amounts of rainfall.

　　The scientists say their findings could have critical implications for understanding the impact of future climate change on human societies. The global temperature will increase by at least 2 Celsius over the next half century.

　　The researchers compared extensive data spanning from ancient times until today. Collecting more material than any prior study did, the researchers were able to show that the Earth's climate plays a more influential role in human affairs than previously thought.

　　Among the historical correlations, researchers found the case of the advanced Mayan civilization which was established around 2,000 BC in what is now Mexico and Central America. Some scholars say this Mesoamerican (中美洲的) civilization peaked from 250 AD to 900 AD, when it mysteriously declined.

　　Scientists and historians, including those involved in this study, theorize that climate change may have had a lot to do with the Mayan decline and failure.

　　41. From the first paragraph, we can know that_________.

　　A. if it snows heavily, there will be a conflict

　　B. enemies dislike global temperatures

　　C. violence has nothing to do with the climate

　　D. warmer climate is linked to increased human violence

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