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As the Trump administration considers oil, gas and mining on lands owned by all Americans, including in national monuments designated under the Antiquities Act, advocates for public lands warn that some places protected for more than a century could be at risk.

Daniel Hart, director of clean energy and climate policy for the National Parks Conservation Association, says most Coloradans don't want federal protections stripped from places such as Dinosaur National Monument. He says time and again, millions of people have spoken out in defense of America's national monuments.

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"They support the outdoor recreation economy, especially in rural states. Those communities nearby are heavily supported by the people who come in and out of these national monuments," he said.

The Trump administration's "Unleashing American Energy" order aims to solidify the United States as a global energy leader by removing what it calls burdensome regulations. Hart said unrestrained and speculative energy development could damage or destroy national monuments -- including Aztec Ruins, Bears Ears, Devils Tower, Hovenweep, Grand Canyon Parashant, Grand Staircase-Escalante and more.

The United States became the world's leading oil producer under the Biden administration, and Hart does not believe there is a need for opening up national monuments for drilling. Some 24 million acres of public lands are already leased to oil and gas companies for fossil-fuel extraction, yet just half are currently active.

"And some lease sales have gone without a bid over the past four years even. The oil industry didn't feel that they needed the land, or they had enough already," he added.

The National Parks Conservation Association is calling on Interior Secretary Doug Burgum to take all national monuments off the table under the new order. Hart said even drilling on lands adjacent to protected areas can lead to industrial contamination of interconnected waterways.

"There's still streams and waters in the Southwest that are unusable by people and animals. That's also a problem with the wildlife, when we tear up their corridors with some of this development for energy," he concluded.