caution images - Joel Sartore

Photographing a male Lelwel hartebeest (Alcelaphus buselaphus lelwel) at the San Antonio Zoo.

Local firefighters from the Palmyra Fire Department practiced their technique on a controlled house burn.

Local firefighters from the Palmyra Fire Department practiced their technique on a controlled house burn.

Local firefighters from the Palmyra Fire Department practiced their technique on a controlled house burn.

Local firefighters from the Palmyra Fire Department practiced their technique on a controlled house burn.

Local firefighters from the Palmyra Fire Department practiced their technique on a controlled house burn.

A sign warns drillers of potential risk at a site near Rifle/Silt, Colorado.

A sign marking natural gas production area near Farmington, New Mexico.

National Geographic Photographer and Speaker