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    Pollution control inspector taking sample of polluted water from spring in field. — Stock Photo
    Pollution control inspector taking sample of polluted water from spring in field.
    Reservoir dam in full spate in Wales. — Stock Photo
    Reservoir dam in full spate in Wales.
    Water quality inspector taking sample of water at suspected pollution site — Stock Photo
    Water quality inspector taking sample of water at suspected pollution site
    Water quality inspector filling sample container with river water at pollution site. — Stock Photo
    Water quality inspector filling sample container with river water at pollution site.
    Environment worker taking sample of polluted water at pollution site. — Stock Photo
    Environment worker taking sample of polluted water at pollution site.
    Cracked earth, Dried out land in drought — Stock Photo
    Cracked earth, Dried out land in drought
    North and South America area of Earth globe, detailed and photorealistic 3d illustration. — Stock Photo
    North and South America area of Earth globe, detailed and photorealistic 3d illustration.
    Detail of sunlight reflecting on clear alpine lake water, along the Pacific Crest Trail — Stock Photo
    Detail of sunlight reflecting on clear alpine lake water, along the Pacific Crest Trail
    Close-up view of goldfish swimming in calm water of pond — Stock Photo
    Close-up view of goldfish swimming in calm water of pond
    Mekong river and brine well at Tibet mangkang county — Stock Photo
    Mekong river and brine well at Tibet mangkang county
    An African jacana, Actophilornis africanus, walking in dry cracked mud — Stock Photo
    An African jacana, Actophilornis africanus, walking in dry cracked mud
    North Pole view of Earth globe, detailed and photorealistic 3d illustration. — Stock Photo
    North Pole view of Earth globe, detailed and photorealistic 3d illustration.
    Asia with clouds view of Earth globe, detailed and photorealistic 3d illustration on white background. — Stock Photo
    Asia with clouds view of Earth globe, detailed and photorealistic 3d illustration on white background.
    Diverse group of women walking along beach, picking up rubbish. eco conservation volunteers, beach clean-up. — Stock Photo
    Diverse group of women walking along beach, picking up rubbish. eco conservation volunteers, beach clean-up.
    A lion, Panthera leo, crouches by water — Stock Photo
    A lion, Panthera leo, crouches by water
    A hippo and calf, Hippopotamus amphibius, walking through a river at sunset — Stock Photo
    A hippo and calf, Hippopotamus amphibius, walking through a river at sunset
    Green Sea Turtles (Chelonia mydas) searching for food, photographed while snorkelling along the Kona coast; Island of Hawaii, United States of America — Stock Photo
    Green Sea Turtles (Chelonia mydas) searching for food, photographed while snorkelling along the Kona coast; Island of Hawaii, United States of America
    Close-up view of green algae seaweed on black background — Stock Photo
    Close-up view of green algae seaweed on black background
    Boat mast and seagulls — Stock Photo
    Boat mast and seagulls
    Dead tree trunks in lake — Stock Photo
    Dead tree trunks in lake
    Traditional sailing boat — Stock Photo
    Traditional sailing boat
    Divers in a cave, fuerteventura canary islands — Stock Photo
    Divers in a cave, fuerteventura canary islands
    Midsection of women picking up plastic rubbish on the beach. conservation volunteers, beach clean-up rubbish. — Stock Photo
    Midsection of women picking up plastic rubbish on the beach. conservation volunteers, beach clean-up rubbish.
    Hippopotamus in the water of the river in the chobe national park, botswana. — Stock Photo
    Hippopotamus in the water of the river in the chobe national park, botswana.
    Herd of elephants drinking water from huddle in safari grassland on a sunny day — Stock Photo
    Herd of elephants drinking water from huddle in safari grassland on a sunny day
    Female leopard and cub crouching down and licking water, looking in camera, Greater Kruger National Park, Africa. — Stock Photo
    Female leopard and cub crouching down and licking water, looking in camera, Greater Kruger National Park, Africa.
    Close-up of the base of three old wooden windmills in a row along a grassy field with sheep grazing on a grassy hillside, near Stompwijk; Netherlands — Stock Photo
    Close-up of the base of three old wooden windmills in a row along a grassy field with sheep grazing on a grassy hillside, near Stompwijk; Netherlands
    Sign advertising Southwest Gifts on a deserted main street. — Stock Photo
    Sign advertising Southwest Gifts on a deserted main street.
    Grandmother and granddaughter planting in the garden on a sunny day — Stock Photo
    Grandmother and granddaughter planting in the garden on a sunny day
    A hippo calf, Hippopotamus amphibius, running through water, in black and white — Stock Photo
    A hippo calf, Hippopotamus amphibius, running through water, in black and white
    Yellow buoys at lake shore — Stock Photo
    Yellow buoys at lake shore
    Mallards ( Anas platyrhynchos ) standing at the water's edge with mist over Mill Pond and houses along the shoreline; Astoria, Oregon, United States of America — Stock Photo
    Mallards ( Anas platyrhynchos ) standing at the water's edge with mist over Mill Pond and houses along the shoreline; Astoria, Oregon, United States of America
    Close-up view of tea set served on glass surface at pond with goldfish — Stock Photo
    Close-up view of tea set served on glass surface at pond with goldfish
    Sea nettle jellyfish underwater in aquarium on blue background. — Stock Photo
    Sea nettle jellyfish underwater in aquarium on blue background.
    A male lion, Panthera leo, crouching down to drink water from a water hole — Stock Photo
    A male lion, Panthera leo, crouching down to drink water from a water hole
    White rhino and calf standing at edge of waterhole with hippo in Africa. — Stock Photo
    White rhino and calf standing at edge of waterhole with hippo in Africa.
    Orangeband Surgeonfish (Acanthurus olivaceus) photographed while scuba diving along the Kona Coast; Island of Hawaii, Hawaii, United States of America — Stock Photo
    Orangeband Surgeonfish (Acanthurus olivaceus) photographed while scuba diving along the Kona Coast; Island of Hawaii, Hawaii, United States of America
    Wind turbines in distance beyond bay, Morecambe Bay, UK — Stock Photo
    Wind turbines in distance beyond bay, Morecambe Bay, UK
    Raditional sailing boat on river — Stock Photo
    Raditional sailing boat on river
    A leopard, Panthera pardus, bending down to drink water from a waterhole — Stock Photo
    A leopard, Panthera pardus, bending down to drink water from a waterhole
    Seals on the beach, Highlands, Scotland, UK — Stock Photo
    Seals on the beach, Highlands, Scotland, UK
    Divers in a cave, fuerteventura canary islands — Stock Photo
    Divers in a cave, fuerteventura canary islands
    Lake shore with tree reflections — Stock Photo
    Lake shore with tree reflections
    Africa, Asia and Europe view of Earth globe, detailed and photorealistic 3d illustration on white background. — Stock Photo
    Africa, Asia and Europe view of Earth globe, detailed and photorealistic 3d illustration on white background.
    Close-up view of fresh green Lotus leaf texture — Stock Photo
    Close-up view of fresh green Lotus leaf texture
    A leopard, Panthera pardus, bending down to drink — Stock Photo
    A leopard, Panthera pardus, bending down to drink
    Close-up view of green water plant leaf and goldfish in pond — Stock Photo
    Close-up view of green water plant leaf and goldfish in pond
    Smiling environmentalist volunteers planting new tree — Stock Photo
    Smiling environmentalist volunteers planting new tree
    Asia North with clouds view of Earth globe, detailed and photorealistic 3d illustration on white background. — Stock Photo
    Asia North with clouds view of Earth globe, detailed and photorealistic 3d illustration on white background.
    A herd of elephants, Loxodonta africana, gather around a waterhole, tree reflections in water. — Stock Photo
    A herd of elephants, Loxodonta africana, gather around a waterhole, tree reflections in water.
    Wooden dock to lake island reflections — Stock Photo
    Wooden dock to lake island reflections
    Scenic view of Rain barrel for rainwater harvesting — Stock Photo
    Scenic view of Rain barrel for rainwater harvesting
    Diverse group of women walking along beach, picking up rubbish. eco conservation volunteers, beach clean-up. — Stock Photo
    Diverse group of women walking along beach, picking up rubbish. eco conservation volunteers, beach clean-up.
    Close-up view of green leaf and goldfish in calm water of pond — Stock Photo
    Close-up view of green leaf and goldfish in calm water of pond
    Three elephants standing at the edge of a watering hole, Namibia — Stock Photo
    Three elephants standing at the edge of a watering hole, Namibia
    Man fishing carp — Stock Photo
    Man fishing carp
    Beautiful goldfish swimming in calm decorative garden pond — Stock Photo
    Beautiful goldfish swimming in calm decorative garden pond
    Sea nettle jellyfish underwater in aquarium on blue background. — Stock Photo
    Sea nettle jellyfish underwater in aquarium on blue background.
    Dead tree trunks in lake — Stock Photo
    Dead tree trunks in lake
    Close-up of lettuce growing in a hydroponic greenhouse, Thailand — Stock Photo
    Close-up of lettuce growing in a hydroponic greenhouse, Thailand