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Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Toxic pond formed from runoff of mine tailings at an abandoned copper mine in the Prescott National Forest near Perkinsville, Arizona, United States of America, North America

Toxic pond formed from runoff of mine tailings at an abandoned copper mine in the Prescott National Forest near Perkinsville, Arizona, United States of America, North America

Whirligig Geyser runoff, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

King penguins (Aptenodytes patagonicus), molting on frozen glacial runoff in St. Andrews Bay, South Georgia, Polar Regions

Whirligig Geyser runoff, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Scenes from in and around the small town of Hellemobotn, Tysfjord in northern Norway. MORE INFO Ice melt runoff forms waterfalls and rivers in this northern town.

Scenes from in and around the small town of Hellemobotn, Tysfjord in northern Norway. MORE INFO Ice melt runoff forms waterfalls and rivers in this northern town.

Meltwater runoff from glaciers in Tracy Arm, Southeast Alaska, USA. The Sawyer glaciers are retreating at an alarming rate in Tracy Arm - possibly due to global warming.

Digestion tanks, sewage work, Emscher wastewater treatment plant, Bottrop, Ruhr area, North Rhine-Westphalia, Germany, Europe

Modern sewage treatment plant, view over a primary clarifier and recirculation basin for nitrification on digester towers, Kulmbach, Bavaria, Germany, Europe

Sewage canal, tunnel, pipe, workman, underground, remodelling of the Emscher River, Emscher-Industrial Waste Canal, Wanne-Eickel, Herne, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Digestion tank, sewage work, Emscher wastewater treatment plant, Bottrop, Ruhr area, North Rhine-Westphalia, Germany, Europe

Modern sewage treatment plant, view over a primary clarifier and recirculation basin for nitrification on digester towers, Kulmbach, Bavaria, Germany, Europe

Modern sewage treatment plant, control buildings and digester towers, Kulmbach, Bavaria, Germany, Europe

Modern sewage treatment plant, view over a recirculation basin on digester towers, Kulmbach, Bavaria, Germany, Europe

Modern sewage treatment plant, view over a clarifier on digester towers, Kulmbach, Bavaria, Germany, Europe