weather and length of the four seasons with summers lasting for half the year in the Northern Hemisphere within 100 years. Winters could last less than two months with spring and autumn also being cut short, with the dramatic changes posing "increased risk to humanity".A team of researchers, who published the study in the journal Geophysical Research Letters, said: "Tropical mosquitoes carrying viruses are likely to expand northward and bring about explosive outbreaks during longer and hotter summers."In response to the research, Congwen Zhu, of the State Key Laboratory of Severe Weather and Institute of Climate System at the Chinese Academy of Meteorological Sciences, said: "A hotter and longer summer will suffer more frequent and.
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