heat

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

Graduates celebrate after leaving their graduation ceremony at the Royal Festival Hall by entering the fountain 'Appearing Rooms', by Danish artist Jeppe Hein, on the Southbank in high temperatures on July 18, 2013 in London, England. The United Kingdom is experiencing a second week of heatwave conditions.

Oli Scarff/Getty Images

University students celebrate and take a refreshing splash to cool down from the high temperatures after their graduation ceremony at the Royal Festival Hall by entering the fountain ‘Appearing Rooms’, by Danish artist Jeppe Hein, on the Southbank, on Thursday in London, England. The UK is experiencing a second week of heatwave conditions

Competitors run in the Badwater Ultramarathon in Death Valley National Park

Lucy Nicholson/Reuters

Competitors take part in the Badwater Ultramarathon in Death Valley National Park, California, in temperatures that can reach 55 degrees centigrade

A man takes a rest in a park from the heat in Shanghai on July 2, 2013. The Shanghai Meteorological Bureau forecast a heat wave as temperatures reached 38 degrees celcius in the city according to state run media.

Peter Parks/AFP

A man takes a rest in a park from the heat in Shanghai on Tuesday. The Shanghai Meteorological Bureau forecast a heat wave as temperatures reached 38 degrees Celsius in the city according to state run media.

  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.

Tourists look at the Singapore Flyer on a hazy day in Singapore June 17, 2013. The haze worsened on Monday with the Pollutant Standards Index (PSI) hitting 111 at 4 pm, according to local media.

Edgar Su/Reuters

Tourists look at the Singapore Flyer on a hazy day in Singapore on Monday. The haze worsened on Monday with the Pollutant Standards Index hitting 111 at 4 pm, according to local media.

People relax in chairs around a fountain as they take in the sun in the Tuileries Garden in central Paris as summer temperatures arrive in France, June 6, 2013.

Charles Platiau/Reuters

People relax in chairs around a fountain as they take in the sun in the Tuileries Garden, central Paris as summer temperatures arrive in France.

An Indian man cools off his horse during...An Indian man cools off his horse during a bath in a canal in Jalandhar on May 23, 2013. High temperatures hovering around 45 degrees Celsius are affecting much of central and northern India ahead of the summer monsoon rains. AFP PHOTO/ SHAMMI MEHRASHAMMI MEHRA/AFP/Getty Images

Shammi Mehrashammi/AFP

An Indian man cools off his horse during a bath in a canal in Jalandhar on Thursday. High temperatures hovering near 45 degrees centigrade are affecting much of central and northern India ahead of the summer monsoon rains.

India Power Protests

Kevin Frayer/AP

Indian workers climb high-tension power cables without safety equipment in New Delhi. A blistering heatwave has caused massive power cuts and water shortages across much of north and western India, with some people taking to the streets to express their anger with the government.

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