A man takes pictures of the annual Perseid meteor shower in in the Monte viso Alps of northern Italy, August 13, 2016. The Perseids happen when Earth hits a wide belt of debris left behind by the comet Tuttle-Swift on its elongated, 133-year orbit around the Sun. (Photo by Marco Bertorello/AFP Photo)





This picture taken on Friday, August 26, 2016, shows an Iranian swimming in Urmia Lake near Urmia, northwestern Iran. Hopes for survival of Urmia salt lake have been revived after more rains boosted a government program aimed at preserving the almost dried up water body. (Photo by Ebrahim Noroozi/AP Photo)





A man crosses a walkway over the Arga River as the sun sets at the end of a summer day, in Pamplona northern Spain, Wednesday, July 27, 2016. (Photo by Alvaro Barrientos/AP Photo)





A woman walks in heavy snowfall in the far eastern Russian city of Vladivostok, December 1, 2014. (Photo by Yuri Maltsev/Reuters)





A woman takes pictures of a tree in Shinjuku Gyoen National Garden on a sunny autumn day in Tokyo December 5, 2014. (Photo by Thomas Peter/Reuters)





A surfer swims at Barra da Tijuca beach in Rio de Janeiro, Brazil July 29, 2015. (Photo by Ricardo Moraes/Reuters)





A woman walks with a dog, with the Moscow International Business Center also known as "Moskva-City" seen in the background, in the capital Moscow, Russia, January 13, 2016. (Photo by Maxim Zmeyev/Reuters)





A climber rests on the edge of Corcovado mountain before the start of the Rio 2016 Olympics in Rio de Janeiro, July 24, 2016. (Photo by Paul Robinson/Reuters)





A woman stands at Cais das Colunas in Lisbon, Portugal August 24, 2016. (Photo by Rafael Marchante/Reuters)





Mount Sinabung spews volcanic ash into the air during an eruption in Karo, North Sumatra, Indonesia August 31, 2016. (Photo by Tibta Perangin-angin/Reuters/Antara Foto)





File photo of a policeman patrolling the slum district of Petare in Caracas, Venezuela November 21, 2009. (Photo by Carlos Garcia Rawlins/Reuters)





An image made available on 04 August 2016 shows a person watching the milky way on the summit of Croix des Chaux (2012m) above Gryon VD, western Switzerland, 03 August 2016. (Photo by Anthony Anex/EPA)





A National Trust worker crosses a log dam on Kinder Scout following a £2.5m project to revive vast areas of the bare and degraded blanket peat landscape in Peak District, England on August 31, 2016. (Photo by Christopher Thomond/The Guardian)





A hiker rests along the Angels Landing trail, overlooking Zion Canyon in Zion National Park in Utah on July 30, 2016. The 5.4 mile round-trip trail features 1,500 foot drop-offs and breathtaking views of Zion Canyon, but is not for the feint of heart, or those afraid of heights. (Photo by Jim Seida/NBC News)





Sami, 16, a Palestinian migrant from Gaza, sits looking out to sea on a seafront jetty during Eid al-Fitr celebrations, marking the end of the fasting month of Ramadan, organised for underage migrants, at a hotel on the northeastern Greek island of Lesbos, Thursday, July 7, 2016. (Photo by Lefteris Pitarakis/AP Photo)





An angler sits and tries his luck fishing on the Polish side of the Oder in Slubice, the neighboring city of Frankfurt (Oder), Germany, photographed from the German side, 10 August 2016. The low water of the river has exposed the sand. (Photo by Patrick Pleul/EPA)





A photo made available 24 August 2016 shows two people looking at the milky way from the summit of the Grande Dent de Morcles (2,969m) above Morcles VD, Switzerland, 23 August 2016. (Photo by Anthony Anex/EPA)





This file photo taken on July 13, 2016 shows Ntoaesele Mashongoane, a 32 years old shephard, calling his sheep as he stands in front of the controversial Katse dam, which only provides water to South Africa on July 13, 2016 in Katse. Farmers in Lesotho have been struggling with an almost year long drought that has devastated crops and left rural areas without water. (Photo by John Wessels/AFP Photo)





A bonfire burns under the nighttime sky during the Sonnwendfeuer (Midsummer) Festival at Mt. Kampenwand in Bavarian Alps, Aschau, 100 km (62 miles) south of Munich, June 22, 2014. (Photo by Lukas Barth/Reuters)





Cloud inversion taken at Sunrise in Mam Tor, Derbyshire, UK on August 30, 2016. (Photo by David Zdanowicz/REX Shutterstock)





Daffodils grow on Mount Washington overlooking the skyline of downtown Pittsburgh, at the confluence of the Monongahela River, right, Allegheny River, left, to form the Ohio River, Sunday, April 26, 2015. (Photo by Gene J. Puskar/AP Photo)





Two ski tourers enjoy the view over Chur and the Calanda mountain range from the Jochalp mountain restaurant which is 2020 meters above sea level, near Parpan, Switzerland. (Photo by Arno Balzarini/EPA)