The risk of fatal heat waves has risen sharply over the past 20 years, and such extreme weather will become more frequent in the future, increasing heat-related excess mortality, a study shows. The study, published in the journal Nature Communications, found that Europe will be particularly affected. Heat waves of the kind we are currently experiencing are particularly deadly for the elderly, the sick and the poor, the researchers said. The 2003 heat wave, which saw temperatures in Europe reach 47.5 degrees Celsius, was one of the worst natural disasters of recent decades, claiming an estimated 45,000 to 70,000 victims