Buffalos escape a fire, which is spreading on a patch of land by the Yamuna river, on a hot summer day in New Delhi, India, June 9, 2015. REUTERS/Anindito Mukherjee TPX IMAGES OF THE DAY

A girl covers her eyes as she walks with her mother on the banks of the Ganges river during a dust storm on a hot summer day in Allahabad, India, June 9, 2015. Temperature in Allahabad on Tuesday is expected to reach 47 degree Celsius (116.6 degree Fahrenheit), according to India's metrological department website. REUTERS/Jitendra Prakash TPX IMAGES OF THE DAY

An ice-cream vendor pulls his cart on the bank of the Ganges river during a dust storm on a hot summer day in Allahabad, India, June 9, 2015. Temperature in Allahabad on Tuesday is expected to reach 47 degree Celsius (116.6 degree Fahrenheit), according to India's metrological department website. REUTERS/Jitendra Prakash

A man keeps a file folder on his head to protect himself from the sun during a hot summer day in New Delhi, India, June 8, 2015. Temperature in New Delhi on Monday is expected to reach 43 Celsius (109.4 degree Fahrenheit), according to India’s metrological department website. REUTERS/Adnan Abidi 

A boy takes bath from a water tap near a polluted water channel during early morning in Kolkata, India, June 5, 2015. Friday marks the annual World Environment Day. REUTERS/Rupak De Chowdhuri 

A boy catches fish in a dried-up pond near the banks of the Ganges river Allahabad, India, June 4, 2015. Temperature in Allahabad on Thursday is expected to reach 44 degree Celsius (111.2 degree Fahrenheit), according to India's metrological department website. India's earth sciences minister has blamed climate change for a heatwave that has killed 2,500 people and for deficient monsoon rains, after the government said on Tuesday the country was headed for its first drought in six years. REUTERS/Jitendra Prakash

A vendor prepares to carry blocks of ice stacked on his motorcycle, to supply a market on a hot summer day in New Delhi, India, June 2, 2015. India's earth sciences minister has blamed climate change for a heatwave that has killed 2,500 people and for deficient monsoon rains, after the government said on Tuesday the country was headed for its first drought in six years. REUTERS/Anindito Mukherjee 

Men relax after applying mud on their bodies to cool themselves off on a hot summer morning on the banks of the river Ganges in Allahabad, India, June 3, 2015. Temperature in Allahabad on Wednesday is expected to reach 44 degree Celsius (111.2 degree Fahrenheit), according to India's metrological department website. India's earth sciences minister has blamed climate change for a heatwave that has killed 2,500 people and for deficient monsoon rains, after the government said on Tuesday the country was headed for its first drought in six years. REUTERS/Jitendra Prakash 

A girl cools off herself in the waters of the river Ganges during a hot summer morning in Allahabad, India, May 31, 2015. Temperature in Allahabad on Sunday is expected to reach 46 degree Celsius (114.8 degree Fahrenheit), according to India's metrological department website. While temperatures regularly top 40 degrees Celsius (104 degrees Fahrenheit) in May and June, parts of the south and east of India have baked under heat as high as 47 degrees Celsius for seven straight days. REUTERS/Jitendra Prakash

TPX IMAGES OF THE DAY

People sleep on the Yamuna river bed under a railway bridge during a hot summer day in the old quarter of Delhi, India, May 31, 2015. While temperatures regularly top 40 degrees Celsius (104 degrees Fahrenheit) in May and June, parts of the south and east of India have baked under heat as high as 47 degrees Celsius for seven straight days. REUTERS/Adnan Abidi 

A man cools himself off at a municipal corporation water treatment plant on a hot summer day in Agartala, India, May 31, 2015. While temperatures regularly top 40 degrees Celsius (104 degrees Fahrenheit) in May and June, parts of the south and east of India have baked under heat as high as 47 degree Celsius for seven straight days. REUTERS/Jayanta Dey

Men sleep on a temporary shade built over a drain next to a slum on a hot summer day in New Delhi, India, May 28, 2015. A heat wave in India has killed at least 1,371 people this week as temperatures soar above 47 Celsius (116.6 Fahrenheit), and doctors' leave has been cancelled to help cope with the sick. REUTERS/Anindito Mukherjee 

Girls, with faces covered to protect themselves from sun stroke, walk along a road on a hot summer day in Allahabad, India, May 29, 2015. A heat wave in India has killed at least 1,371 people this week as temperatures soar above 47 Celsius (116.6 Fahrenheit), and doctors' leave has been cancelled to help cope with the sick. REUTERS/Jitendra Prakash 

A woman walks along the road with her face covered to protect herself from sun stroke on a hot summer day in Chandigarh, India, May 28, 2015. A heat wave in India has killed at least 1,371 people this week as temperatures soar above 47 Celsius (116.6 Fahrenheit), and doctors' leave has been cancelled to help cope with the sick. REUTERS/Ajay Verma 

A Sadhu or a Hindu holyman sleeps at a railway station on a hot summer day in Allahabad, India, May 27, 2015. Soaring temperatures have gripped parts of southern and northern India in an extreme heat wave which has killed more than 500 people and looks set to continue this week, officials said on Monday. REUTERS/Jitendra Prakash
TPX IMAGES OF THE DAY

A passenger sleeps along with her children at a railway station on a hot summer day in Allahabad, India, May 26, 2015. Temperature in Allahabad on Tuesday is expected to reach 46.4 degree Celsius (115.5 degree Fahrenheit), according to India's metrological department website. REUTERS/Jitendra Prakash 

A man sleeps under the shade of a tree on a hot summer day at a public park in New Delhi, India, May 27, 2015. Soaring temperatures have gripped parts of southern and northern India in an extreme heat wave which has killed more than 500 people and looks set to continue this week, officials said on Monday. REUTERS/Anindito Mukherjee

A customer stands beside stacked air coolers kept for sale at a shop on a hot summer day in New Delhi, India, May 28, 2015. A heat wave in India has killed at least 1,371 people this week as temperatures soar above 47 Celsius (116.6 Fahrenheit), and doctors' leave has been cancelled to help cope with the sick. REUTERS/Adnan Abidi 

Boys jump into the waters of the Sabarmati river to cool off themselves on a hot summer day in Ahmedabad, India, May 24, 2015. Temperature in Ahmedabad on Sunday reached 43 degree Celsius (109.4 degree Fahrenheit), according to India's metrological department website. REUTERS/Amit Dave
TPX IMAGES OF THE DAY

A labourer takes a nap in a basket at a wholesale vegetable market on a hot summer day in Kolkata, India, May 25, 2015. Temperature in Kolkata on Monday is expected to reach 37 degrees Celsius (98.6 degree Fahrenheit), according to India's metrological department website. REUTERS/Rupak De Chowdhuri

A vendor sleeps on his ice-cream handcart on a hot summer day in Allahabad, India, May 28, 2015. A heat wave in India has killed at least 1,371 people this week as temperatures soar above 47 Celsius (116.6 Fahrenheit), and doctors' leave has been cancelled to help cope with the sick. REUTERS/Jitendra Prakash 

A vendor sleeps next to stacked cartons of air coolers kept for sale at a shop on a hot summer day in New Delhi, India, May 28, 2015. A heat wave in India has killed at least 1,371 people this week as temperatures soar above 47 Celsius (116.6 Fahrenheit), and doctors' leave has been cancelled to help cope with the sick. REUTERS/Adnan Abidi 

Sheep cross a parched area of a dried-up pond on a hot summer day on the outskirts of New Delhi, India, May 27, 2015. Soaring temperatures have gripped parts of southern and northern India in an extreme heat wave which has killed more than 500 people and looks set to continue this week, officials said on Monday. REUTERS/Anindito Mukherjee