Hamish the first polar bear bear cub to be born in the UK for 25 years cools down in the pond in his enclosure at The Highland Wildlife Park near Kingussie, Scotland, Britain July 26, 2018. REUTERS/Russell Cheyne 

A man jumps into a sprinkler in Berlin, Germany, July 25, 2018. REUTERS/Hannibal Hanschke 

A volunteer, for recovery work, uses emergency water supply to cool down as he takes a break in a heat wave at a flood affected area in Kurashiki, Okayama Prefecture, Japan, July 14, 2018. REUTERS/Issei Kato 

A girl plays in a water fountain on a hot summer day in Tbilisi, Georgia, July 2, 2018. REUTERS/David Mdzinarishvili 

Pamir, an 11-year-old Tien Shan White Claw bear, is sprayed with water to cool down on a hot summer day with the air temperature at about 35 degrees Celsius (95 degrees Fahrenheit) at the Royev Ruchey zoo in the suburb of Krasnoyarsk, Russia June 26, 2018. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY 

Aurora, an eight-year-old female polar bear, eats a trout in a pool during a hot summer day at the Royev Ruchey zoo in Krasnoyarsk, Russia June 21, 2018. REUTERS/Ilya Naymushin 

A polar bear plays with a ice block filled with apples on a hot day at an amusement park in Yongin, South Korea, June 21, 2018. REUTERS/Kim Hong-Ji 

Horse Racing - Derby Festival - Epsom Downs Racecourse, Epsom, Britain - June 2, 2018 A horse is cooled down after the race Action Images via Reuters/Andrew Boyers TPX IMAGES OF THE DAY 

A man cools off near a leaking water pipeline, during hot and humid weather in Karachi, Pakistan May 3, 2018. REUTERS/Akhtar Soomro 

People gather near fountains of water as they cool off at the Miroir d'Eau (Mirror of Water), in Nantes as unusually high temperatures hit France, April 20, 2018. REUTERS/Stephane Mahe TPX IMAGES OF THE DAY 

Traditional eggs are cooled in a bucket on the eve of Orthodox Easter in the town of Bobruisk, Belarus, April 7, 2018. REUTERS/Vasily Fedosenko 

Central American migrants, part of a caravan moving through Mexico toward the U.S. border, freshen up during a stop on their route to Puebla, on a highway in Veracruz, Mexico April 6, 2018. REUTERS/Henry Romero 

A seagull stands atop a fountain in Saint Peter's Square at the Vatican, February 4, 2018. REUTERS/Max Rossi TPX IMAGES OF THE DAY 

Hippos run into a river at the Mpala Research Centre in Laikipia County Kenya, January 7, 2018. REUTERS/Baz Ratner 

Hippos splash water in a river at the Mpala Research Centre in Laikipia County Kenya, January 6, 2018. Picture taken January 6, 2018. REUTERS/Baz Ratner 

A seagull stands on a fountain in Saint Peter's Square at the Vatican January 1, 2018. REUTERS/Max Rossi 

A Sumatran tiger licks a frozen blood lollipop on a hot summer day at the Bioparco zoo in Rome, Italy June 27, 2017. REUTERS/Tony Gentile TPX IMAGES OF THE DAY 

A woman cools off in water fountains in a park as hot summer temperatures hit Paris, France, June 22, 2017. REUTERS/Jean-Paul Pelissier TPX IMAGES OF THE DAY 

Yozhik, a male Himalayan bear, cools down under a stream of water sprayed by an employee in an enclosure on a hot summer day, with the air temperature at about 34 degrees Celsius (93.2 degrees Fahrenheit), at the Royev Ruchey zoo in Krasnoyarsk, Russia June 21, 2017. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY 

Boys swim in a stream during a heatwave in Islamabad, Pakistan June 5, 2017. REUTERS/Caren Firouz TPX IMAGES OF THE DAY 

People are silhouetted as they cool off in water fountains in a park as hot spingtime temperatures hit Paris, France, May 25, 2017. REUTERS/Pascal Rossignol 

People are silhouetted as they cool off in water fountains in a park as hot spingtime temperatures hit Paris, France, May 25, 2017. REUTERS/Pascal Rossignol 

A police officer sprays air freshener inside the club where police detained 141 men for what they described as a gay prostitution ring, in Jakarta, Indonesia May 23, 2017. REUTERS/Darren Whiteside 

A mahout bathes his elephant in the river Sabarmati on a hot summer day in Ahmedabad, India May 21, 2017. REUTERS/Amit Dave 

Flags of the United States and Israel are seen printed on car fresheners at a workshop manufacturing flags in preparation for U.S. President Donald Trump's visit, in Kfar Saba, Israel May 21, 2017. REUTERS/Amir Cohen TPX IMAGES OF THE DAY 

Flags of the United States and Israel are seen printed on car fresheners at a workshop manufacturing flags in preparation for U.S. President Donald Trump's visit, in Kfar Saba, Israel May 21, 2017. REUTERS/Amir Cohen 

A coffee is being made in a french press in Bangkok, Thailand May 5, 2017. Picture taken May 5, 2017. REUTERS/Jorge Silva 

A devotee offers prayer while taking a holy bath at Matathirtha to commemorate his departed mother during Mother's Day in Kathmandu, Nepal, April 26, 2017. REUTERS/Navesh Chitrakar 

A devotee takes a holy bath at Matathirtha to commemorate his departed mother during Mother's Day in Kathmandu, Nepal, April 26, 2017. REUTERS/Navesh Chitrakar 

A boy plays with water fountains on a hot day in Colombo, Sri Lanka April 8, 2017. REUTERS/Dinuka Liyanawatte TPX IMAGES OF THE DAY 

Boys play with water fountains on a hot day in Colombo, Sri Lanka April 8, 2017. REUTERS/Dinuka Liyanawatte 

Men bathe in the river Ganges in Kanpur, India, April 3, 2017. REUTERS/Danish Siddiqui 

ATTENTION EDITORS - VISUALS COVERAGE OF SCENES OF DEATH OR INJURY A soldier sprays air freshener over bodies of victims after flooding and mudslides caused by heavy rains in Villagarzon, Colombia April 2, 2017. REUTERS/Jaime Saldarriaga 

Children play at a musical fountain in Managua, Nicaragua, February 4, 2017. REUTERS/Oswaldo Rivas 

A migrant refreshes himself with water as he waits to disembark from Italian Coast Guard patrol vessel Diciotti in the Sicilian harbour of Catania, Italy, November 16, 2016. REUTERS/ Antonio Parrinello 

Cows stand in a saltwater pond to refresh themselves at the Agropil ranch in Boqueron, Paraguay, August 14, 2016. REUTERS/Jorge Adorno SEARCH "BOQUERON DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A girl cools off with drinkable water at a source in Port-au-Prince, Haiti, September 7, 2016. Picture taken September 7, 2016. REUTERS/Andres Martinez Casares 

Children play as they cool down in a fountain beside Manzanares river in Madrid July 30, 2016. REUTERS/Javier Barbancho 

Supporters of U.S. Senator Bernie Sanders cool off from a water hydrant during a protest march ahead of the 2016 Democratic National Convention in Philadelphia, Pennsylvania on July 24, 2016. REUTERS/Adrees Latif 

Supporters of U.S. Senator Bernie Sanders cool off from a water hydrant during a protest march ahead of the 2016 Democratic National Convention in Philadelphia, Pennsylvania on July 24, 2016. REUTERS/Adrees Latif 

A supporter of U.S. Senator Bernie Sanders cools off from a water hydrant as she takes part in a protest march ahead of the 2016 Democratic National Convention in Philadelphia, Pennsylvania on July 24, 2016. REUTERS/Adrees Latif 

People carry beverages to cool off during a hot and sunny day at Central Park in New York, U.S., July 17, 2016. REUTERS/Eduardo Munoz 

People cool off at a fountain during a hot and sunny day at Central Park in New York, U.S., July 17, 2016. REUTERS/Eduardo Munoz 

People cool off in the fountain at Washington Square Park in the Manhattan borough of New York City, U.S. July 5, 2016. REUTERS/Brendan McDermid 

A woman cools off in the fountain at Washington Square Park in the Manhattan borough of New York City, U.S. July 5, 2016. REUTERS/Brendan McDermid 

An Al-Furqan Brigade fighter (R) swims inside an irrigation pool with local children to cool down from summer heat, in Tel Mamo village, in the southern countryside of Aleppo, Syria June 23, 2016. REUTERS/Khalil Ashawi 

Football Soccer - France v Albania - EURO 2016 - Group A - Stade V?lodrome, Marseille, France - 15/6/16
France's Paul Pogba cools down during the match
REUTERS/Yves Herman
Livepic

Football Soccer - France v Albania - EURO 2016 - Group A - Stade V?lodrome, Marseille, France - 15/6/16
France's Paul Pogba cools down during the match
REUTERS/Yves Herman
Livepic

Football Soccer - France v Albania - EURO 2016 - Group A - Stade V?lodrome, Marseille, France - 15/6/16
France's Paul Pogba cools down during the match
REUTERS/Yves Herman
Livepic

A man cools off from the heat in a stream on a hot summer day, on the outskirts of Islamabad, Pakistan, May 20, 2016. REUTERS/Faisal Mahmood

The shadow of a boy is seen as he jumps into the Ganges river to cool off on a hot summer day on the outskirts of Kolkata, India, April 22, 2016. REUTERS/Rupak De Chowdhuri TPX IMAGES OF THE DAY

People affected by the earthquake which struck off Ecuador's Pacific coast, freshen up in Chindul April 19, 2016. REUTERS/Guillermo Granja 

People affected by the earthquake which struck off Ecuador's Pacific coast, freshen up in Chindul April 19, 2016. REUTERS/Guillermo Granja 

Children play in mud to cool off on a hot day in New Delhi, India, April 4, 2016. Temperature in New Delhi on Monday is expected to reach to 38 degree Celsius (100.4 degree Fahrenheit), according to India's metrological department website. REUTERS/Anindito Mukherjee TPX IMAGES OF THE DAY 

Children cool themselves under misting fans at the Australian Open tennis tournament at Melbourne Park, Australia, January 21, 2016. REUTERS/Tyrone Siu 

A man holds his son up to a cooling fan on the first day of the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. REUTERS/Thomas Peter 

A boy cools off with water inside a monument, during a heatwave hitting the country, in Vina del Mar, Chile, January 17, 2016. REUTERS/Rodrigo Garrido 

A worker freshens up the decorations for Nacho Duato's ballet The Nutcracker at the Mikhailovsky theatre in St. Petersburg, November 20, 2015. Picture taken November 20, 2015 REUTERS/Grigory Dukor 

A worker freshens up the decorations for Nacho Duato's ballet The Nutcracker at the Mikhailovsky theatre in St. Petersburg, November 20, 2015. Picture taken November 20, 2015 REUTERS/Grigory Dukor 

Skiers and snowboarders enjoy fresh snow at Squaw Valley in Olympic Valley, California, December 5, 2015. An El Nino is forecasted for California, and regular precipitation has been welcomed after years of drought. Picture taken December 5. REUTERS/Max Whittaker