政府间气候变化问题小组(Intergovernmental Panel on Climate Change)将于今日发布迄今最大的一份关于气候变化问题的报告。报告预计，人类活动导致全球变暖，可能招致水资源短缺、热浪、暴风雨和洪水等后果。

Water shortages, heatwaves, storms and floods are likely to be the result of global warming caused by human actions, the biggest report yet on climate change will predict today.


联合国(UN)召集设立的政府间气候变化问题小组，主要任务是评估气候变化科学。该小组的第四份报告草案显示，到2100年，预计全球气温可能会升高约3摄氏度。

Global temperatures are likely to rise by about 3°C by 2100, according to the draft of the fourth report by the Intergovernmental Panel on Climate Change, convened¹ by the United Nations and charged with assessing climate change science.

这一升幅足以再让多达40亿人面临水资源严重短缺的危险。科学家们对升温幅度的预估区间为2摄氏度至4.5摄氏度，3摄氏度是"最佳估计"。目前全球气温仅比上个冰川期的地表温度高约5摄氏度，凸显出3摄氏度升温的严重程度。

The rise - the "best estimate" of the scientists from a range of predictions between a rise of 2°C and 4.5°C - would be enough to put as many as 4bn extra people at risk of serious water shortages. The extent of the temperature change is illustrated² by the fact that the difference between today's world and the planet's surface in the last ice age is only about 5°C.