A pump jack operates at a well site leased by Devon Energy Production Company near Guthrie, Oklahoma
A drilling site south of Stillwater, Oklahoma
A large wind farm at sunset in Seiling, Oklahoma.
Cattle graze in front of the Wynnewood refinery in Wynnewood, Oklahoma. Nick Oxford for The New York Times
Crude oil storage tanks are seen from above at the Cushing oil hub in Cushing, Oklahoma.
Enbridge Inc.'s crude oil storage tanks are seen during a tour of their tank farm in Cushing, Oklahoma
The Devon Energy Center stands out above the rest of the skyline in Oklahoma City.
Cars pass by the Wynnewood refinery at sunset in Wynnewood, Oklahoma.
An oil rig operates at night near Pawnee Buttes Colorado