In this June 8, 2017 photo, oil derricks are busy pumping as the moon rises near the La Paloma Generating Station in McKittrick, Calif. California’s vast San Joaquin Valley, the country’s most productive farming region, is engulfed by some of the nation’s dirtiest skies, forcing the state’s largest air district to spend more than $40 billion in the past quarter-century to enforce hundreds of stringent pollution rules. Its bad air is the byproduct of booming farms, oil production, two major highways, a web of rail lines - and the valley’s bowl-shaped geography. (AP Photo/Gary Kazanjian)
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