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• Rainfall intensity has increased by 20% |





Rainfall intensity has increased by 20%

As the world warms, the increased evaporation is putting greater amounts of water vapour into the atmosphere. Rainfall intensity rises by 7% for each degree of additional warming.* With temperatures approaching 3°C (5.4°F) above the 20th century average, the most extreme rainfall events are now 20% more intense than before. Dramatic increases in surface runoff, peak river flows and flash flooding are being experienced around the world – exacerbating soil erosion and putting huge pressure on drainage and sewage systems. This additional rainfall is a particular problem in the tropics and poor regions with insufficient infrastructure or flood defences.


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1 Increases in extreme rainfall linked to global warming, The University of Adelaide:
Accessed 18th February 2013.


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