Workers images - Joel Sartore

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Men use chainsaws and heavy equipment to cut large trees in the miombo woodland that forms the ‘buffer zone’ around the Gorongosa National Park in Mozambique, Africa. This buffer zone is being logged and is largely devoid of game.

Picture of workers of the eastern subterranean termites (Reticulitermes flavipes) at the Dallas Zoo.

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Workers of the eastern subterranean termites (Reticulitermes flavipes) at the Dallas Zoo.

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Logging, fires and charcoal, are detrimental to the miambo woodland forest that comprises the ‘buffer zone’ between Gorongosa National Park and the Mt. Gorongosa range in Mozambique, Africa.

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Workers handle a solar panel at a concentrated solar power plant in Nevada.

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Workers in hard hats and uniforms walk among shipping containers at the port of Salvador, Brazil.

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Women hand-roll cigars at a factory in Salvador, Brazil.

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An aloe plant in an aloe field, where many of the workers are resident aliens, Mexican citizens with green cards allowing them to work in the United States. The aloe leaves will be processed into ointments, cosmetics, and beverages after harvest.

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A lamb leaps up after being relieved of his tail for better sanitation purposes by Bureau of Land Management workers on federal grazing lands in southern Wyoming.

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Miners masked against sun and cold carve up the land in search of borax in Chile’s Atacama desert.

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Mexican laborers build a border wall near Alamo, Texas.

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Mexican laborers constructing the border wall that separate the United States from Mexico near Alamo, Texas.

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Mexican laborers constructing the border wall that separate the United States from Mexico near Alamo, Texas.

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Workers from Southern Native Plants out of Milton, Florida planting sea oats (Uniola paniculata) on a newly created sand dune to protect Dauphin Island, Alabama from the deep water horizon oil spill.

Workers washing an oiled brown pelican (Pelecanus occidentalis) at the rehab center in Fort Jackson, Louisiana. This is where the majority of the oiled birds were brought in from the deep water horizon oil spill.

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Workers washing an oiled brown pelican (Pelecanus occidentalis) at the rehab center in Fort Jackson, Louisiana. This is where the majority of the oiled birds were brought in from the deep water horizon oil spill.

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Workers from Southern Native Plants out of Milton, Florida are planting sea oats (Uniola paniculata) in sand dunes on Dauphin Island, Alabama.

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A crew of BP contractors attempt to siphon oil from the Deepwater Horizon spill out of a marsh in the Gulf of Mexico.

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A BP clean up crew tries to sop oil from the Deepwater Horizon spill at Queen Bess Island, Louisiana.

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A biologist working for the National Parks Service holds an introduced (non-native) trout at the Sixty Lake Basin of King’s Canyon National Park, Nevada.

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A team searches for amphibians in a cloud forest reserve near Mindo, Ecuador.

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A team searching for amphibians in a cloud forest reserve near Mindo, Ecuador.

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A man with newly-installed wood stove at the Dunbar farmhouse.

Two men look over a spring-fed pool containing Noel's amphipod at Bitter Lake National Wildlife Refuge.

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Two men look over a spring-fed pool containing Noel’s amphipod at Bitter Lake National Wildlife Refuge.

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A critically endangered (IUCN) and federally endangered pallid sturgeon (Scaphirhynchus albus) is photographed getting measured by a fish crew with the Missouri Dept. of Conservation. This crew is surveying fish populations in the Missouri River near Atchinson, Kansas.

The staff of Conservation Fisheries in Knoxville, Tennessee, studies, tags and fin clips two examples of the rarest fish in the United States, the Conasauga logperch (Percina jenkinsi). These fish are part of "The Desparate Dozen", a list of critically imperilled fish here in the southeast. (IUCN: Vulnerable; US: Endangered)

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The staff of Conservation Fisheries in Knoxville, Tennessee, studies, tags and fin clips two examples of the rarest fish in the United States, the Conasauga logperch (Percina jenkinsi). These fish are part of “The Desparate Dozen”, a list of critically imperilled fish here in the southeast. (IUCN: Vulnerable; US: Endangered)

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A crew from the Tennessee Aquarium Conservation Institute uses electro shocker nets to collect and survey declining freshwater species in the Conasauga River in Tennessee.