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    California oak tree with spreading branches and green leaves in backlit. — Stock Photo
    California oak tree with spreading branches and green leaves in backlit.
    Logging boom boats at coastal village of Beaver Cove, Kokish River, British Columbia, Canada — Stock Photo
    Logging boom boats at coastal village of Beaver Cove, Kokish River, British Columbia, Canada
    Close-up of bottle of water in landscape of Black Rock Desert in Nevada — Stock Photo
    Close-up of bottle of water in landscape of Black Rock Desert in Nevada
    Field of flowering crops, wild flowers and trees on horizon. — Stock Photo
    Field of flowering crops, wild flowers and trees on horizon.
    Man thatching a roof — Stock Photo
    Man thatching a roof
    Three wind turbines — Stock Photo
    Three wind turbines
    Two weightlifters lifting weights in an urban environment. — Stock Photo
    Two weightlifters lifting weights in an urban environment.
    Student in wheelchair studying natural gas fuel line on furnace in HVAC classroom — Stock Photo
    Student in wheelchair studying natural gas fuel line on furnace in HVAC classroom
    Woman watering plants in the garden on a sunny day — Stock Photo
    Woman watering plants in the garden on a sunny day
    Girl holding toy rabbit sitting on sofa — Stock Photo
    Girl holding toy rabbit sitting on sofa
    Forest with maple tree with red leaves in autumn. — Stock Photo
    Forest with maple tree with red leaves in autumn.
    Full moon above sailboats in Mill Bay, Vancouver Island, British Columbia, Canada — Stock Photo
    Full moon above sailboats in Mill Bay, Vancouver Island, British Columbia, Canada
    Trees in autumnal foliage on bank of country river. — Stock Photo
    Trees in autumnal foliage on bank of country river.
    Previously burnt sub-alpine forest rebounding in summer with lodge-pole pines and variety of wildflowers, yarrow, aster, arnica and corn lilies. — Stock Photo
    Previously burnt sub-alpine forest rebounding in summer with lodge-pole pines and variety of wildflowers, yarrow, aster, arnica and corn lilies.
    Thatcher standing on ladder on roof — Stock Photo
    Thatcher standing on ladder on roof
    Railroad tracks extending across flat Utah desert landscape at dusk, USA. — Stock Photo
    Railroad tracks extending across flat Utah desert landscape at dusk, USA.
    Scorcio sul lago e il castello di Toblino in Valle dei Laghi, Trentino Alto Adige, Italy, Europe, wiev on Toblino lake and Toblino Castle — Stock Photo
    Scorcio sul lago e il castello di Toblino in Valle dei Laghi, Trentino Alto Adige, Italy, Europe, wiev on Toblino lake and Toblino Castle
    Instructor using demo board to explain HVAC control system operation one student in wheelchair — Stock Photo
    Instructor using demo board to explain HVAC control system operation one student in wheelchair
    Side view of man sitting in armchair and using digital tablet. — Stock Photo
    Side view of man sitting in armchair and using digital tablet.
    Thatcher sitting on bundles of straw — Stock Photo
    Thatcher sitting on bundles of straw
    Skyline At Dusk at Tokyo — Stock Photo
    Skyline At Dusk at Tokyo
    Instructor discussing fuel mixture controls for furnace in HVAC classroom while one student in wheelchair taking notes — Stock Photo
    Instructor discussing fuel mixture controls for furnace in HVAC classroom while one student in wheelchair taking notes
    Portrait of happy Caucasian female conservation volunteer cleaning up the countryside, picking up rubbish her friends around her. Ecology and social responsibility in rural environment. — Stock Photo
    Portrait of happy Caucasian female conservation volunteer cleaning up the countryside, picking up rubbish her friends around her. Ecology and social responsibility in rural environment.
    Fisherman on sailing boat — Stock Photo
    Fisherman on sailing boat
    Abstract blurred motion of Craters of the Moon National Monument, Idaho, USA. — Stock Photo
    Abstract blurred motion of Craters of the Moon National Monument, Idaho, USA.
    Sky with clouds over prairie and dirt road leading into distance. — Stock Photo
    Sky with clouds over prairie and dirt road leading into distance.
    Girl holding toy rabbit sitting on sofa — Stock Photo
    Girl holding toy rabbit sitting on sofa
    Man inspecting solar panel — Stock Photo
    Man inspecting solar panel
    Boy in baseball cap playing with toy car — Stock Photo
    Boy in baseball cap playing with toy car
    Conceptual shot of Lagoon Nebula Rising over Jasper Forest, Petrified Forest National Park, Arizona, USA — Stock Photo
    Conceptual shot of Lagoon Nebula Rising over Jasper Forest, Petrified Forest National Park, Arizona, USA
    Young woman doing yoga positions in urban environment. — Stock Photo
    Young woman doing yoga positions in urban environment.
    Portrait of multi ethnic group of happy conservation volunteers cleaning up river in the countryside with board Thank You. Ecology and social responsibility in rural environment. — Stock Photo
    Portrait of multi ethnic group of happy conservation volunteers cleaning up river in the countryside with board Thank You. Ecology and social responsibility in rural environment.
    A Fire Escape Going Up The Side Of A Brick Building — Stock Photo
    A Fire Escape Going Up The Side Of A Brick Building
    Portrait of of happy Caucasian female conservation volunteer cleaning up the countryside with board Our Future, her friends in the background. Ecology and social responsibility in rural environment. — Stock Photo
    Portrait of of happy Caucasian female conservation volunteer cleaning up the countryside with board Our Future, her friends in the background. Ecology and social responsibility in rural environment.
    Bundles of plastic bottles — Stock Photo
    Bundles of plastic bottles
    Portrait of Caucasian male conservation volunteer cleaning up river in the countryside, his friends picking up rubbish in the background. Ecology and social responsibility in rural environment. — Stock Photo
    Portrait of Caucasian male conservation volunteer cleaning up river in the countryside, his friends picking up rubbish in the background. Ecology and social responsibility in rural environment.
    Broadway Bridge; Portland — Stock Photo
    Broadway Bridge; Portland
    Towers of bologna with dome — Stock Photo
    Towers of bologna with dome
    Rows of commercially grown poplar trees — Stock Photo
    Rows of commercially grown poplar trees
    Man photographing mountain peaks, Italy — Stock Photo
    Man photographing mountain peaks, Italy
    Man standing in front of an eco home — Stock Photo
    Man standing in front of an eco home
    Rear view of a man sitting in a wheelchair in an office — Stock Photo
    Rear view of a man sitting in a wheelchair in an office
    Children chasing bubbles around garden — Stock Photo
    Children chasing bubbles around garden
    Close-up of a giraffe head, Indonesia — Stock Photo
    Close-up of a giraffe head, Indonesia
    Detail of lush, green grass and sidewalk — Stock Photo
    Detail of lush, green grass and sidewalk
    Plantation of poplar trees — Stock Photo
    Plantation of poplar trees
    Man in blue shirt holding smartphone and cup of coffee at office kitchen. — Stock Photo
    Man in blue shirt holding smartphone and cup of coffee at office kitchen.
    Green grass blowing in wind, close-up. — Stock Photo
    Green grass blowing in wind, close-up.
    Scenic view of mountain nature — Stock Photo
    Scenic view of mountain nature
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom — Stock Photo
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom
    Woman and a child in eco house — Stock Photo
    Woman and a child in eco house
    Caucasian male teacher holding windmill model teaching a girl during environment class at school. school and education concept — Stock Photo
    Caucasian male teacher holding windmill model teaching a girl during environment class at school. school and education concept
    Traditional sailing boats — Stock Photo
    Traditional sailing boats
    View of bay of kotor — Stock Photo
    View of bay of kotor
    Student demonstrating air conditioner recharging manifold with gauges in HVAC classroom — Stock Photo
    Student demonstrating air conditioner recharging manifold with gauges in HVAC classroom
    Burnt lodgepole pine forest from destructive forest fire at dusk. — Stock Photo
    Burnt lodgepole pine forest from destructive forest fire at dusk.
    Student setting up generator experiment while instructor discusses HVAC system to student in wheelchair — Stock Photo
    Student setting up generator experiment while instructor discusses HVAC system to student in wheelchair
    Recycled bottles at recycling centre — Stock Photo
    Recycled bottles at recycling centre
    Boy standing behind father in kitchen — Stock Photo
    Boy standing behind father in kitchen
    Two weightlifters lifting weights in an urban environment. — Stock Photo
    Two weightlifters lifting weights in an urban environment.