A draft UN report three years in the making concludes that man-made climate change has boosted the frequency or intensity of heat waves, wildfires, floods and cyclones and that such disasters are likely to increase in the future.
The document being discussed by the world's Nobel-winning panel of climate scientists says the severity of the impacts vary, and some regions are more vulnerable than others.
Hundreds of scientists working under the Intergovernmental Panel for Climate Change (IPCC) will vet the phonebook-sized draft at a meeting in Kampala of the 194-nation body later this month.
"This is the largest effort that has even been made to assess how extremes are changing," said Neville Nicholls, a professor at Monash University in Melbourne, Australia, and a coordinating lead author of one of the review's key chapters. Mindful of an outcry by climate skeptics over flaws in an earlier IPCC text, those working on the document stress that the level of "confidence" in the findings depends on the quantity and quality of data available.
But the overall picture that emerges is one of enhanced volatility and frequency of dangerous weather, leading in turn to a sharply increased risk for large swathes of humanity in coming decades. More