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In page Extreme weather:

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During excessive heat, plants shut their leaf pores (stomata), a protective mechanism to conserve water but also curtails plants' absorption capabilities. This leaves more pollution and ozone in the air[citation needed], which leads to higher mortality in the population[citation needed]. It has been estimated that extra pollution during the hot summer of 2006 in the UK, cost 460 lives.[5] The European heat waves from summer 2003 are estimated to have caused 30,000 excess deaths, due to heat stress and air pollution.[6] Over 200 U.S cities have registered new record high temperatures.[7] The worst heat wave in the US occurred in 1936 and killed more than 5000 people directly. The worst heat wave in Australia occurred in 1938–39 and killed 438. The second worst was in 1896.