Sea plane and yacht, Hamilton Island, Great Barrier Reef, Queensland, Australia, Pacific

Sign protected area (Zone de Reserva), Cies Islands, Atlantic Islands Galicia Maritime Terrestrial National Park, Galicia, Spain, Europe

Tourists at the Empire State Building viewing platform enjoying the view, Manhattan, New York City, New York, United States of America, North America

March 1, 2010 - Sabo channel at Haramatsu River with tubular grid dam (slit dam type), for defense and protection against mudflows, with Sakurajima volcano in background, Japan

Sign warning against feeding sharks, Half Moon Caye, Mesoamerican Barrier Reef, Belize

The Eastern Point lighthouse, Gloucester, Massachussetts, New England, United States of America, North America

Old city walls, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Trucks on the Great Western Highway from Sydney to Adelaide, New South Wales, Australia

Car waits at railway crossing in Ascott-Under-Wychwood, Oxfordshire, United Kingdom

Protective cover on car near fence

Father helping daughter balance on wooden fence

Pink anemonefish, Amphiprion perideraion, in sea anemone, Great barrier reef marine park, Australia (South Pacific).

Juvenile and adult pink anemonefish in sea anemone, Amphiprion perideraion, Fila Reef, Port Vila, Vanuatu (S. Pacific).

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

Fans of Partizan Belgrad behind barbed-wire fence in the fan block of the Mercedes Benz Arena, Stuttgart, Baden-Wuerttemberg, Germany, Europe

Storm surge barrier, Delta Works, Zeeland, Holland, Netherlands, Europe

Storm surge barrier, Delta Works, Zeeland, Holland, Netherlands, Europe

Closed storm surge barrier The Maeslantkering in the Nieuwe Waterweg waterway between Hoek van Holland and Maassluis, part of the Delta Works, Netherlands

Avalanche protection on Maloja Pass, Bregaglia, Grisons, Switzerland, Europe

Oosterscheldekering, the Oosterschelde storm surge barrier, Zeeland, Netherlands

Closed storm surge barrier The Maeslantkering in the Nieuwe Waterweg waterway between Hoek van Holland and Maassluis, part of the Delta Works, Netherlands

Barbed wire fence in front of a warehouse

Train passing a closed railroad crossing, Bingen, Hesse, Germany, Europe

The Thames Flood Barrier, designed to help keep London from flooding during high storm tides, United Kingdom, Europe

Wooden fences, protection from snow avalanches and snow drifts, Austria, Europe

Avalanche protection on Maloja Pass, Bregaglia, Grisons, Switzerland, Europe

Avalanche barriers in the Stubaital valley, Tyrol, Austria, Europe

Passenger train passing a level crossing in winter, Grevenbroich, North Rhine-Westphalia, Germany, Europe

Passenger train passing a level crossing in winter, Grevenbroich, North Rhine-Westphalia, Germany, Europe

Padlock, Made in Germany, at a barrier fence along the Rhine Promenade, Duesseldorf, North Rhine-Westphalia, Germany, Europe

Padlock, Made in Germany, at a barrier fence along the Rhine Promenade, Duesseldorf, North Rhine-Westphalia, Germany, Europe

Padlock, Made in Germany, at a barrier fence along the Rhine Promenade, Duesseldorf, North Rhine-Westphalia, Germany, Europe

Smashed concrete sea defenses at Ulrome near Skipsea on Yorkshires East Coast, UK. The sea has eroded past the barriers and left them stranded further down the beach. The coast is composed of soft boulder clays, very vulnerable to coastal erosion. This section of coast has been eroding since Roman times, with many villages having disappeared into the sea, and is the fastest eroding coast in Europe. Climate change is speeding up the erosion, with sea level rise, increased stormy weather and increased heavy rainfall events, all playing their part.

Safety cones lined up across a rural road, Saskatchewan canada

Man in wheelchair holding caution tape

Height Requirment Sign In Front Of Amusement Park Ride, Tigard, Oregon, United States

Tropical Beach and Harbor at Dawn, Honolulu, HI, United States of America

close-up of barbed wire

Low angle view of no trespassing sign

cone barrier