An aerial view of the Oseberg oil platform in the Norwegian sea prior to the visit of Austrian President Heinz Fischer and Norwegian King Harald. Reuters Archive.

The oil platform Statfjord A is seen in the Norwegian sector of the North Sea in this undated file photo. An oil spill at the large Statfjord oilfield in the North Sea shut about 138,000 barrels per day, Norway. Reuters Archive.

A sand sculpture of an oil platform model is displayed at the Rio Oil and Gas Expo and Conference in Rio de Janeiro, Brazil. Reuters Archive.

An aerial view of the site of a gas pipeline explosion on the highway to Reynosa in the municipality of General Bravo, some 145 km (90 miles) from Monterrey, Mexico. Reuters Archive

Prince Johan Friso, son of Queen Beatrix, smiles during his wedding in the Oude Kerk in Delft. Prince Friso died today Monday 12th August 2013, 18 months after his ski accident. Reuters Archive

Dutch Prince Johan Friso and his daughter Zaria ski during a photocall at the Austrian alpine ski resort of Lech am Arlberg, Prince Friso died today Monday 12th August 2013, 18 months after his ski accident. Reuters Archive

A firefighter hangs from a chopper over the Costa Concordia cruise ship which ran aground off the west coast of Italy at Giglio island. Reuters Archive

Flamingos prepare for flight, running on dried salt which remains from a saltwater lake, Iran. Reuters Archive.

Swimmers train in the warm-up pool at the XIV Pan American Games in Santo Domingo. Reuters Archive.

Rza Rzayev of Azerbaijan jumps between small salt flower ponds in the Rui Simeao saltworks in Tavira in the southern province of Algarve, Portugal. Reuters Archive

Matoula Kastrioti, 46, who suffers from multiple sclerosis, sits on a «Seatrac», a solar-powered device that allows people with kinetic disabilities to enter and get out of the sea autonomously, at a beach in Alepochori, west of Athens, Greece. Reuters Archive

A helicopter is used by the Bureau of Land Management (BLM) to gather wild horses in the Conger Mountains near Border in Utah, USA. Reuters Archive.

A Mexican dressed in Aztec costume lights a flame for the Pan-American games, at the Teotihuacan archaeological site, a monument of the Aztecs, about 60 km (37 miles) north of Mexico City. Reuters Archive

A man walks past a graffiti accompanied by the words: «Militia of Mona Lisa» at Mohamed Mahmoud street in Cairo, Egypt. Reuters Archive

Students hang upside down in hammocks as they take part in an «antigravity» yoga class at the Om Factory in New York, USA. Reuters Archive.