Sea

Children play on a shark net at Little Manly Cove as shark experts assess cutting-edge technologies to counter attacks at a summit in Sydney on September 29, 2015, following an "unprecedented" spate of encounters in eastern Australia this year that has left one dead and seven injured.  Australia is home to one of the world's highest incidents of shark attacks, with the two-day summit, which include researchers from the US and South Africa, organised in part to address community fears after the recent incidents on the north coast of the most populous state New South Wales

William West/AFP

Children play on a shark net at Little Manly Cove as shark experts assess cutting-edge technologies to counter attacks at a summit in Sydney on Tuesday, following an “unprecedented” spate of encounters in eastern Australia this year that has left one dead and seven injured

Refugees and migrants arrive on the shore of the Greek island of Lesbos after crossing the Aegean Sea from Turkey on Monday. UN Secretary-General Ban Ki-moon welcomed the European Union's decision to inject $1 billion to help countries overwhelmed by Syrian refugees, but said more must be done to relocate migrants

Aris Messinis/AFP

Refugees and migrants arrive on the shore of the Greek island of Lesbos after crossing the Aegean Sea from Turkey on Monday

The autumn sun rises over the north sea next to The Couple by artist Sean Henry at Newbiggin-by-the-Sea, Northumberland, as mixed conditions and colder nights are in store for Britain following the arrival of the autumn equinox

Owen Humphreys/PA

The autumn sun rises over the north sea next to The Couple by artist Sean Henry at Newbiggin-by-the-Sea, Northumberland, as mixed conditions and colder nights are in store for Britain following the arrival of the autumn equinox

 Smooth Harbour taken in Porthleven, Cornwall by Bernie Pettersen, which was the overall winner in a national photography competition to find the UK's best sea view

Bernie Pettersen/Shipwrecked Mariners' Society/PA

Smooth Harbour taken in Porthleven, Cornwall by Bernie Pettersen, which was the overall winner in a national photography competition to find the UK’s best sea view

U.S. President Barack Obama views Bear Glacier on a boat tour of Kenai Fjords National Park in Seward, Alaska

Jonathan Ernst/Reuters

U.S. President Barack Obama views Bear Glacier on a boat tour of Kenai Fjords National Park in Seward, Alaska. Obama is on a three day visit to Americas most northern state

A migrant hugs his family after safetly arriving to the shores of Kos island from Turkey on Tuesday. Authorities on the island of Kos have been so overwhelmed that the government sent a ferry to serve as a temporary centre to issue travel documents to Syrian refugees -- among some 7,000 migrants stranded on the island of about 30,000 people. The early hours are the safest time for migrants travelling from Turkey to the Greek islands just across the water, which have seen a huge influx of refugees escaping the civil war in Syria and chaos in Afghanistan since the beginning of this year.

Louisa Gouliamaki/AFP

A migrant hugs his family after safely arriving to the shores of Kos island from Turkey on Tuesday

A Syrian migrant arrives after crossing from Turkey by a rubber boat, seen in the background, in the southeastern island of Kos, Greece, Monday, Aug. 17, 2015. Greek authorities said Sunday they have started resettling migrants living in tents in a park in the capital Athens   but many were wary and had moved out ahead of the operation. More than 130,000 migrants have reached Greece so far in 2015, straining the country's resources

Alexander Zemlianichenko/AP

A Syrian migrant arrives after crossing from Turkey by a rubber boat, seen in the background, in the southeastern island of Kos, Greece, Monday

A long-distance swimmer dives into the Atlantic Ocean at dawn, Friday, July 24, 2015, in Falmouth, Maine. The woman is part of a group that regularly starts their day with a 2-mile swim. Many of the swimmers keep a float tethered to their bodies for safety

Robert F. Bukaty/AP

A long-distance swimmer dives into the Atlantic Ocean at dawn on Friday, in Falmouth, Maine. The woman is part of a group that regularly starts their day with a 2-mile swim

Divers swim above toilets from a wreck near the Yolanda Reef at Ras Mohammad, close to Sharm El Sheikh, Egypt, 23 July 2015. The famous dive site of the Ras Mohammed National Park contains the remains of the 'Yolanda' wreck, which sank in the 1970s, leaving toilets and bath tubs on the sea bed.

Sergey Dolzhenko/EPA

Divers swim above toilets from a wreck near the Yolanda Reef at Ras Mohammad, close to Sharm El Sheikh, Egypt on thursday. The famous dive site of the Ras Mohammed National Park contains the remains of the ‘Yolanda’ wreck, which sank in the 1970s, leaving toilets and bath tubs on the sea bed

People sunbathe at Levante Beach on Wednesday in Benidorm, Spain

David Ramos/Getty Images

People sunbathe at Levante Beach on Wednesday in Benidorm, Spain

Fisherman cast their lines off a jetty in the early morning hours as dark clouds loom over the Atlantic Ocean, Tuesday, July 21, 2015, in Bal Harbour, Fla.

Wilfredo Lee/AP

Fisherman cast their lines off a jetty in the early morning hours as dark clouds loom over the Atlantic Ocean on Tuesday, in Bal Harbour, Florida

A man floating in the waters filled with algae at a beach in Qingdao, in eastern China's Shandong province. The algal phenomenon, an annual occurrence in Qingdao, is usually caused by an abundance of nutrients in the water, especially phosphorus, although the triggers for the enormous blooms which began to appear in the Yellow Sea in 2007 remain uncertain

AFP

A man floats in the waters filled with algae at a beach in Qingdao, in eastern China’s Shandong province. The algal phenomenon, an annual occurrence in Qingdao, is usually caused by an abundance of nutrients in the water, especially phosphorus

An Indian boy walks by the Arabian Sea coast piled with garbage, mostly plastic waste, in Mumbai, India, Friday, June 26, 2015. Several recent reports have highlighted India s worsening air quality and termed its capital New Delhi the worst polluted city in the country. In the last decade, along with India's economic boom and increasing prosperity, the output of garbage has also increased manifold

Rajanish Kakade/AP

An Indian boy walks by the Arabian Sea coast piled with garbage, mostly plastic waste, in Mumbai, India on Frida

A freighter lies off the coast at sunrise in Algiers, Algeria June 25, 2015.

Ramzi Boudina/Reuters

A freighter lies off the coast at sunrise in Algiers, Algeria on Thursday

Migrants sit on the deck of the Belgian Navy vessel Godetia after they were saved at sea during a search and rescue mission in the Mediterranean Sea off the Libyan coasts, Wednesday, June 24, 2015. Hundreds of migrants were rescued on Tuesday by the Godetia, which is part of a EU Navy vessels fleet taking part in the Triton migrants rescue operation

Gregorio Borgia/AP

Migrants sit on the deck of the Belgian navy vessel Godetia after they were saved at sea during a search and rescue mission off the Libyan coast

Visitors react on the rock as a man jumps into the water, above Cleopatra's Beach, on a summer s day before the start of the holy month of Ramadan, which begins on June 18, at the Mediterranean city of Marsa Matrouh...Visitors react on the rock as a man jumps into the water, above Cleopatra's Beach, on a summer s day before the start of the holy month of Ramadan, which begins on June 18, at the Mediterranean city of Marsa Matrouh, northwest of Cairo, Egypt.

Amr Abdallah Dalsh/Reuters

Visitors react on the rock as a man jumps into the water, above Cleopatra’s Beach, on a summer s day before the start of the holy month of Ramadan at the Mediterranean city of Marsa Matrouh, northwest of Cairo, Egypt

Great Britain's Nick Dempsey comes home to win the first race of the day during the Men's RS:X windsurfing on day five of the ISAF Sailing World Cup at Weymouth. PRESS ASSOCIATION Photo. Picture date Wednesday June 12, 2015.

Andrew Matthews/PA

Great Britain’s Nick Dempsey comes home to win the first race of the day during the Men’s RSX windsurfing on day five of the ISAF Sailing World Cup at Weymouth on Friday

Contestants jump into the water pit during the women's 3000m steeplechase finals at the Southeast Asian (SEA) Games in Singapore June 12, 2015.

Edgar Su

Contestants jump into the water pit during the women’s 3000m steeplechase finals at the Southeast Asian (SEA) Games in Singapore on Friday

A migrant, who was found at sea on a boa...A migrant, who was found at sea on a boat, arrive at a temporary shelter near the Kanyin Chaung jetty to MeeThike sub-township outside Maungdaw township, northern Rakhine state on June 4, 2015.  More than 700 migrants found adrift on a fishing boat six days ago disembarked in Myanmar's western state of Rakhine as the US warned it was monitoring their fate "very closely".    AFP PHOTO / YE AUNG THUYe Aung Thu/AFP/Getty Images

Ye Aung Thu/AFP/Getty

A migrant, who was found at sea on a boat, arrives at a temporary shelter near Maungdaw township, northern Rakhine state, Myanmar

Malaysia v Vietnam - Men's Singles - Vietnam's Tran Tuan Quynh in action

Singapore SEA Games Organising Committee/Action Images/Reuters

Vietnam’s Tran Tuan Quynh in action during the Malaysia v Vietnam Men’s Singles match in Singapore