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　　Global warming is not only a threat to our future health，it already contributes to more than 150，000 deaths and 5 million illnesses annually，according to a team of health and climate scientists at the World Health Organization and the University of Wisconsin at Madison-and those numbers could double by 2030.　

　　Research data published in the journal Nature show that global warming may affect human health in a surprising number of ways: speeding the spread of infectious diseases such as malaria and dengue fever；creating conditions that lead to potentially fatal malnutrition and diarrhea；and increasing the likelihood of heat waves and floods.

　　According to the scientists，who have mapped the growing health impacts of global warming，the data show that global warming affects different regions in very different ways. Global warming is particularly hard on people in poor countries，which is ironic，because the places that have contributed the least to global warming are most exposed to the death and disease higher temperatures can bring.

　　"Those least able to cope with and least responsible for the greenhouse gases that cause global warming are most affected，" said lead author Jonathan Patz，a professor at UW­Madison's Gaylord Nelson Institute for Environmental Studies，"Here lies an enormous global ethical challenge."

　　According to the Nature report，regions at highest risk for enduring the health effects of climate change include coastlines along the Pacific and Indian oceans and sub­Saharan Africa. Large cities，with their urban "heat island" effect，are also prone to(有倾向的) temperature­related health problems. Africa has some of the lowest per­capita (每人的) emissions of greenhouse gases. Yet，regions of the continent are gravely at risk for diseases related to global warming.

　　"Many of the most important diseases in poor countries，from malaria to diarrhea and malnutrition，are highly sensitive to climate，" said co­author Diarmid Campbell­Lendrum of WHO."The health sector is struggling to control these diseases and climate change threatens to weaken these efforts."

"Recent extreme climatic events have underlined the risks to human health and survival，" added Tony McMichael，director of the National Centre for Epidemiology and Population Health