For more than half a century, the American environmental movement has struck a familiar rhythm: alarm, action, and industry backlash.

The first Earth Day in 1970 helped launch the modern movement, and by the end of that year, the Environmental Protection Agency was born. It was a promise that government had a crucial role to play, that it could protect our air and water from industry polluters.

Over the decades, that promise has ebbed and flowed: environmental rules were expanded under presidents from both parties, then pared back under others, only to be reinforced again as new science and public pressure emerged.

Critics — including historian Douglas Brinkley and former EPA administrators from both parties — argue the rollback push is an attempt to turn back decades of federal environmental protections.

Meanwhile, a striking silence is showing up in a place with massive moral reach. A new large-scale study of more than 700,000 Catholic parish sermons finds that climate change is rarely mentioned, even after the late Pope Francis issued some of the strongest language on climate change written by a religious leader.

Harvard historian of science Naomi Oreskes led that research. She joined The Metro’s Robyn Vincent to discuss the price of that silence.

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