Pointing out that there have been periods of extreme weather patterns before, he said: "These kinds of fluctuations are part of human history, but climate change is probably making them more extreme.
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"We are getting to a point where we are getting more water, more rainy days, but it's more variable, so it leads to droughts and it leads to floods," Sunita Narain, the head of the Centre for Science and Environment in India, told AFP on the sidelines of the World Water Week conference.
"That is leading to huge amounts of stress on agriculture and livelihoods," she said, adding that "climate change is making rainfall even more variable.
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Narain was one of around 2,500 experts from 130 countries gathered in Stockholm for the 20th edition of the World Water Week, which opened Sunday and is set to run until Saturday.
Her comments came as eight million people in Pakistan remain dependent on handouts for their survival after monsoons caused devastating floods throughout the country.