They calculate that in Paris, the hottest city in Europe during the heatwave in summer 2003, 506 out of 735 summer deaths recorded in the French capital were due to a heatwave made worse by man-made climate change. The impact of climate change was less severe in London, with an additional 64 deaths out of a total of 315 heat-related deaths, says the paper published in the scientific journal, Environmental Research Letters. The study, led by the University of Oxford, suggests that such research gives policymakers better information about the damaging effects of heatwaves to help them respond to the future challenges of climate change
The findings were generated by putting the results of climate model simulations of the 2003 heatwave into a health impact assessment of death rates. Using computer time donated by thousands of volunteers from the weather@home project, the researchers ran many thousands of high-resolution regional climate model simulations. They found that human-induced climate change increased the risk of heat-related deaths in central Paris by around 70% and by 20% in London.