Tidal Beacon art installation, Queens Marque, Downtown Halifax Waterfront, Halifax, Nova Scotia, Canada, North America

Three of the fifteen huge moai statues standing with their backs to the ocean, restored by archaeologists after destruction in 1960 by a tidal wave, Ahu Tongariki, Easter Island, UNESCO World Heritage Site, Chile, South America

View of the Washington Monument, Tidal Basin and cherry blossom trees in spring, Washington D.C., United States of America, North America

Tidal Sand Patterns at Luskentyre Sands, Isle of Harris, Outer Hebrides, Scotland, United Kingdom, Europe

Tidal stream on beach, Balnakeil, near Durness, Sutherland, Highland, Scotland, United Kingdom, Europe

A creek at low tide winding through tidal salt marsh with Chesapeake Bay in the background, Virginia, United States of America, North America

Tidal Beacon art installation, Queens Marque, Downtown Halifax Waterfront at sunset, Halifax, Nova Scotia, Canada, North America

Sloop Lagoon, Bay of Fires, Bay of Fires Conservation Area, Tasmania, Australia, Pacific

Tidal Beacon art installation, Queens Marque, Downtown Halifax Waterfront at sunset, Halifax, Nova Scotia, Canada, North America

Tidal rock pools and Mumbles Lighthouse, Bracelet Bay, Mumbles Head, Gower Peninsula, Swansea, Wales, United Kingdom, Europe

Tidal stream on beach, Balnakeil, near Durness, Sutherland, Highland, Scotland, United Kingdom, Europe

Arcachon, Gironde, Aquitaine, France, Europe

Tidal Pools on Bigbury beach at dawn, Bigbury-on-Sea, South Hams, Devon, England, United Kingdom, Europe

Tidal pools and sand patterns on a deserted Combesgate Beach, North Devon, England, United Kingdom, Europe

Cherry blossoms and Tidal Basin, Washington, DC, United States of America, North America

Tidal pools on a deserted sandy beach at sunrise, Harlyn Bay, Cornwall, England, United Kingdom, Europe

Rockpool with barnacles, mussels, limpets and seaweed at Kilkee, County Clare, West Coast of Ireland

Bladderwrack bladder seaweed and limpets on the rocks in Kilkee, County Clare, West Coast of Ireland

Couple walking on the beach leave footprints in the sand at Woolacombe, North Devon, UK

Sun's rays over rough sea at dawn on a windy day at Rosslare, South East Ireland

Bladderwrack bladder seaweed and limpets on the rocks in Kilkee, County Clare, West Coast of Ireland

Man walking Labrador Retriever dog on the beach at Woolacombe, North Devon, UK

Brighton Pier, on the shoreline of the South Coast in England, United Kingdom

The mouth of the Mossman River at Newell Beach, Daintree, Australia

Sailing boat moored at low tide in the Port Douglas estuary, Queensland, Australia

Boat moored in tidal creek, Bosham village, West Sussex, England, United Kingdom, Europe

A loan boat in the tidal channel at Burnham Overy Staithe, Norfolk, England, United Kingdom, Europe

Traveller looks out over the mouth of the Mossman River at Newell Beach, Daintree, Australia

Waves crashing over the rocks at Kynance Cove in Cornwall, South West England.

Contaminated water being emptied out of Finland Docks in Hull, directly into the Humber Estuary, Yorkshire, UK. As they released the pollution, there was an awful chemical stench in the air.

Raw sewage emptying directly onto the beach from a sewage pipe coming from a caravan park in Kilnsea, Spurn Point, Yorkshire, UK.

Wadden Sea at low tide, Wadden Sea National Park, Westerheversand, Eiderstedt Peninsula, Schleswig Holstein, Germany, Europe

Wadden Sea at low tide, Wadden Sea National Park, Westerheversand, Eiderstedt Peninsula, Schleswig Holstein, Germany, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Sunset over Morecambe Bay, Cumbria, England, United Kingdom, Europe

Harbour / Common seals (Phoca vitulina) entering the surf. NE Scotland (RR)

Orkney Islands Sept 2011 Wave and Tidal Power shoot The Wello Penguin

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - Tidal Generation Limited - backed by Rolls Rpyce -TGL is are currently operating a 500kWe concept demonstrator unit at The European Marine Energy Centre (EMEC) Tidal site in Orkney. This has been generating since September 2010 and provides power for up to 300 homes.

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Tidal currents showing in natural patterns (of dead plankton). Walker Bay, Western Cape, South Africa.

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Waves coming ashore at Cape Cornwall, North Cornish Coast, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Adult chinstrap penguin (Pygoscelis antarctica) hopping from rock to rock after returning from the sea to feed its chicks on Elephant Island, Antarctica.

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Adult chinstrap penguin (Pygoscelis antarctica) returning from the sea to feed its chicks on Elephant Island, Antarctica.

Walkers crossing Morecambe Bay at low tide with the Queens Guide Cedric Robinson in Lancashire, England, United Kingdom, Europe

Mangrove swamp at high tide in Cairns, Queensland, Australia, Pacific

oystercatcher: haematopus ostralegus, at edge of tidal lagoon, montrose basin, angus, scotland

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Adult chinstrap penguin (Pygoscelis antarctica) reflected in calm tidal water after returning from the sea to feed its chicks on Elephant Island, Antarctica.

Rocky tide pools and sea shore at Lone Ranch Beach, Oregon, United States of America, North America

Low tide and shoreline, Rangiroa, French Polynesia

Walkers crossing Morecambe Bay at low tide with the Queens Guide Cedric Robinson in Lancashire, England, United Kingdom, Europe

Rocky tide pools and sea shore at Lone Ranch Beach, Oregon, United States of America, North America

Waves coming ashore at Cape Cornwall, North Cornish Coast, England, United Kingdom, Europe

Rocky tide pools and sea shore at Lone Ranch Beach, Oregon, United States of America, North America

A tidal swimming pool at Priests Cove on Cape Cornwall, Cornwall, England, United Kingdom, Europe

Waves coming ashore at Cape Cornwall, North Cornish Coast, England, United Kingdom, Europe

Adult Whimbrel (Numenius phaeopus) feeding at low tide on the tidal flats in San Ignacio Lagoon, Baja California Sur, Mexico.

Waves coming ashore at Cape Cornwall, North Cornish Coast, England, United Kingdom, Europe

Adult Whimbrel (Numenius phaeopus) feeding at low tide on the tidal flats in San Ignacio Lagoon, Baja California Sur, Mexico.

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

The Breach at Alkborough created in the sea defences to allow sea water to flood agricultural land and create a wetland for wildlife, Humber Estuary, Humberside, England, United Kingdom, Europe

Salt marshes at dusk. Cerroja water mill. Santoￃﾱa, Victoria and Joyel Marshes Natural Park. Cantabria, Spain, Europe.

Salt marshes at dusk. Cerroja water mill. Santoￃﾱa, Victoria and Joyel Marshes Natural Park. Cantabria, Spain, Europe.

Aerial view of the construction of a wind turbine in the North Sea, Lower Saxony, Germany

Moeraki Boulders, spherical concretions, stone ball, Otago, South Island, New Zealand

Beach at sunset, tidal channel, Juist Island, Nationalpark, North Sea, East Frisian Islands, National Park, Unesco World Heritage Site, East Frisia, Lower Saxony, Germany, Europe

View of wooden posts with orange ropes in the Venice Lagoon, Pellestrina, Veneto, Italy, Europe

Aerial view of the uninhabited Trischen Island, Meldorf Bay, North Sea, Schleswig-Holstein, Germany

Aerial view of stilted buildings on the beach, North Sea coast, St Peter-Ording, North Friesland, Schleswig-Holstein, Germany

Aerial view of King River with mangroves and tidal mud flats, Wyndham, Kimberey, West Australia, Ausrtalia

Aerial above the sandy beach, coast of East Frisian island Spiekeroog, Lower Saxony, Germany

Stilted buildings on the beach at St Peter-Ording, Schleswig-Holstein, North Sea coast, Germany

aerial photo of Amrum, one of the North Frisian Islands on the German coast of the North Sea in the Federal State of Schleswig-Holstein

Aerial of North Sea islands, Wangerooge and Spiekeroog with the mainland in the background, Lower Saxony, Germany

Aerial of Minsener Oog and Wangerooge, East Friesian Island, Lower Saxony, Germany

Aerial of North Sea island, Spiekeroog and mainland in background, Lower Saxony, Germany

Woman walking through tidal pools at lowtide at Wharariki Beach, northwest coast, South Island, New Zealand

aerial photo of Amrum and saand dunes, one of the North Frisian Islands on the German coast of the North Sea in the Federal State of Schleswig-Holstein

A canal in the tidal land reflecting clouds, Eiderstedt peninsula, North Friesland, Schleswig-Holstein, Germany

Tidal Current, Saltstraumen, Bodo, Nordland, Norway

Buildings on stilts on the beach at St Peter-Ording, Schleswig-Holstein, North Sea coast, Germany

Closed storm surge barrier The Oosterscheldekering (Eastern Scheldt storm surge barrier) between the islands Schouwen-Duiveland and Noord-Beveland, part of the Delta works series of dams, protecting the Netherlands from flooding, Netherlands

In the mangrove forest - reflection of roots and branches, The Gambia, Africa

Fort Grey, now a museum, boats lying dry on the seabed at low tide, Rocquaine Bay, Guernsey, Channel Islands, Europe

Breakwaters or groynes, coastal protection measures, Noderfriedrichskoog tidal flats, Nationalpark Schleswig-Holsteinisches Wattenmeer, Schleswig-Holstein Wadden Sea National Park, Eiderstedt peninsula, North Friesland region, Schleswig-Holstein, Germany,

Saltwort tidal flats, pioneer vegetation, salt marsh vegetation (Salicornia), red in autumn, Norderfriedrichskoog tidal flats, Nationalpark Schleswig-Holsteinisches Wattenmeer, Schleswig-Holstein Wadden Sea National Park, Eiderstedt peninsula, North Fries

Riprap as a costal protection measure, Norderfriedrichskoog tidal flats, Nationalpark Schleswig-Holsteinisches Wattenmeer, Schleswig-Holstein Wadden Sea National Park, Eiderstedt peninsula, North Friesland region, Schleswig-Holstein, Germany, Europe

View across the Wadden Sea with coastal protection, groynes, Hallig Langeness, small island, at back, North Sea shore, Schleswig-Holstein Wadden Sea National Park, Dithmarschen region, Schleswig-Holstein, Germany, Europe