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The original of this article was published at nofibs.com.au
The latest study of extreme weather events has concluded that 3 out of 4 heatwaves and extreme heat events and nearly one in five heavy rainfall events, on a global scale, can be attributed to human contributions to global warming through greenhouse gas emissions. As temperatures continue to rise, the percentage is set to increase even further.
The researchers looked at 'moderate' extremes, which they defined as events expected to occur on 1 in every 1,000 days under present conditions. It involved examining data on extreme weather events around the globe in a dataset going back more than 100 years, and using two dozen climate models.
There has been a growing ability to attribute some single extreme weather events via Fractional Attribution of Risk (FAR) to anthropogenic climate change. Some of the specific individual extreme heatwave and precipitation events that have directly been attributed include the flood risk in England and Wales in autumn 2000 (Pall et al 2013), the European heatwave of 2003 (Stott et al 2004), the 2010 Russian heat wave (Otto et al 2012), and Australia’s record summer temperatures of 2013 (Lewis and Karoly 2013).
This study, rather than looking at individual events, examined the change in extreme weather events on a global scale for the statistical attribution to climate change.