Heatwave

People sit in the sun in Sheldon Square in west London...People sit in the sun in Sheldon Square in west London July 19, 2013. Britain's first prolonged heatwave in seven years has taken the country by surprise, with rails buckling, shops selling out of electric fans, and scientists estimating the surge in temperature could have caused hundreds of premature deaths.   REUTERS/Paul Hackett   (BRITAIN - Tags: ENVIRONMENT)

Paul Hackett/Reuters

People sit in the sun in Sheldon Square in west London on Friday. Britain’s first prolonged heatwave in seven years has taken the country by surprise, with rails buckling, shops selling out of electric fans, and scientists estimating the surge in temperature could have caused hundreds of premature deaths. Read more

Two women sunbathe on the shore of the Vistula River in Warsaw...Two women sunbathe on the shore of the Vistula River in Warsaw June21, as temperatures soar to over 30 degrees Celsius (86 Fahrenheit)  REUTERS/Peter Andrews (POLAND - Tags: ENVIRONMENT TPX IMAGES OF THE DAY)

Peter Andrews/Reuters

Two women sunbathe on the shore of the Vistula river in Warsaw, Poland.

A man sunbathes at Ada Ciganlija lake in Belgrade, Serbia, Thursday, June 20, 2013. The Balkan region is experiencing a heat wave, with temperatures rising as high as 37 degrees Celsius (99 Fahrenheit).

Marko Drobnjakovic/AP

A man sunbathes at Ada Ciganlija lake in Belgrade, Serbia. The Balkan region is experiencing a heat wave, with temperatures rising as high as 37 degrees Celsius (99 Fahrenheit).

  A young woman from Brazil cools off in a fountain on a scorching hot summer day in the city center on June 20, 2013 in Berlin, Germany. Central Europe is in the grips of a heat wave in which temperatures in some regions have reached up to 38 degrees celsius.

Sean Gallup/Getty Images

A young woman from Brazil cools off in a fountain on a scorching hot summer day in the city centre in Berlin, Germany.

An Indian commuter pours water over his head to cool off as young children watch from a window at a railway station in Allahabad, India, Monday, May 20, 2013. Most of north India has been reeling under heat wave conditions with temperature soaring to over 46 degree Celsius (115 degrees Fahrenheit). (AP Photo/Rajesh Kumar Singh)

Rajesh Kumar Singh/AP

An Indian commuter pours water over his head to cool off as young children watch from a window at a railway station in Allahabad, India on Monday. Most of north India has been reeling under heat wave conditions with temperature soaring to over 46 degree Celsius (115 degrees Fahrenheit) Read more