Pittsburgh-based EQT Corp. may be the largest U.S. natural gas producer, but a commitment to reducing carbon emissions led management to spend $28 million to replace or retrofit 100% of its gas-powered pneumatic devices.

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The initiative led to a 70% reduction in methane emissions. The annual carbon footprint also declined, down by 305,614 metric tons of carbon dioxide equivalent.

CEO Toby Z. Rice unveiled a strategy he referred to as the “era of sustainable shale” in the transition to a low-carbon future.

“We told the world we were aggressively addressing methane emissions, and we did what we promised,” CEO Toby Z. Rice said. “As the nation’s largest natural gas producer, EQT not only delivered on its commitment to eliminate a major source of methane emissions in...