British artist, Mark Coreth sits on top of the “Sydney Ice Bear” carved from a 10 tonne block of ice to illustrate how humans affect climate change in the Arctic at Customs House on June 3, 2011 in Sydney, Australia. The public will be welcomed to touch the bear, and leave an imprint which will begin the melting process and act as a metaphor for how humans affect the environment. The ice bear's has visited six cities on it's global tour since 2009; the visit to Sydney coincides with World Environment Day on June 5. (Photo by Lisa Maree Williams/Getty Images)

Cylists hang to the back of a truck outside the capital Bujumbura, July 19, 2015, as the country awaits next week's presidential elections. Each day scores of cyclists make the 45 kilometer downhill journey at breakneck speed from Bugarama to sell bananas, often hanging from the back of trucks for the return uphill trip. (Photo by Mike Hutchings/Reuters)

A group of daredevil divers get perilously close to a school of deadly sharks – and one even lies on his back with his arm folded. The relaxed diver swims on his back and almost hugs the shark who is floating directly above him. The freedivers – Carlos Estrabeau, 28, and 29-year-old Ocean Ramsey – are friends with photographer Raul Boesel Jr. Photographer Raul Boesel Jr from Curitiba, Brazil, travelled to West End in the Bahamas to capture images of the giant sharks. (Photo by Raul Boesel/Solent News & Photo Agency)

A adorable bear cub cant get enough of playing buckaroo – as it hangs onto its mum splashing about in a river. His mum was attempting to catch a fish supper for the pair as the plucky cub continued to jump on her back. And as she was concentrating on her meal the young bear became a distraction. So she sprung into life with him on her back before he was tossed into the water much to his delight. (Photo by Lisa Sidorsky/Caters News)

North Korea has closed its borders in fear of the spread of the Ebola virus. But at a time when the secretive state was still welcoming tourists, former aid worker Andrew Macleod made the journey to the repressive nation. Andrew's holiday snaps and camera footage provide a unique insight into the reclusive country, where he came across deserted motorways, metro stations plastered with propaganda and attractive border guards. Here: a female traffic police officer in the snow in February 2013, in Pyongyang, North Korea. (Photo by Andrew Macleod/Barcroft Media)

Kia Vue of St. Paul sports long nails at the Minnesota Hmong New Year celebration Saturday, November 29, 2014, at the Saint Paul RiverCentre in St. Paul, MN. The annual Minnesota Hmong New Year celebration will be held at the Saint Paul RiverCentre November 28–30. Hmong New Year has a deep cultural significance to the Hmong community. It is a celebration of accomplishments during the past year and a time to welcome a new beginning. (Photo by David Joles/Star Tribune)

Children play at the Ryoji Ikeda exhibition “the transfinite” at the Park Avenue Armory on June 10, 2011 in New York City. The audio visual installation, which will close after tomorrow, features two back-two-back screens displaying a continual loop of sounds, fragments of numbers and strobe-lit patterns that echo the Japanese artist's interest in mathematics, the subconscious and the digital world. (Photo by Spencer Platt/Getty Images)

Runners gather at the start line for the annual “Santa Speedo Run”, a charity race through the streets of the Back Bay neighborhood of Boston. (Photo by Gretchen Ertl/Reuters)