More than seven million Californians live within a mile of an oil or gas well, which studies show can create silent health hazards. Now, there are efforts to put more distance between people and pollutants. NewsHour Weekend Special Correspondent Tom Casciato has the story, beginning in the small city of Arvin. This story is part of our ongoing series, Peril and Promise: The Challenge of Climate Change. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders