Republican lawmakers held back-to-back hearings Tuesday to challenge climate intervention strategies and EPA enforcement under former President Joe Biden.

Chairman Clay Higgins, R-La., opens a hearing entitled "From Protection to Persecution: EPA Enforcement Gone Rogue Under the Biden Administration," at a House Oversight Subcommittee on Federal Law Enforcement session Tuesday on Capitol Hill in Washington.. Photo by Bridget Erin Craig/UPI UPI

WASHINGTON, Sept. 16 (UPI) -- As the United States faces shifts stemming from President Donald Trump's climate priorities and changes within the Environmental Protection Agency, Republican lawmakers held back-to-back hearings Tuesday to challenge climate intervention strategies and EPA enforcement under former President Joe Biden.

The House Oversight Committee hearings unfolded against the backdrop of major Trump administration moves to roll back environmental oversight.

Since January, the EPA has enacted changes that scrap emissions reporting and dismantle research offices, a signal Democratic lawmakers think the agency is prioritizing industry concerns and cost savings over transparency and scientific independence.

On Tuesday morning, the Delivering on Government Efficiency Subcommittee met to discuss "Playing God with the Weather-A Disastrous Forecast," which focused heavily on geoengineering and weather modification.

Later in the day, the Subcommittee on Federal Law Enforcement held a hearing on "From Protection to Persecution: EPA Enforcement Gone Rogue Under the Biden Administration," which focused on instances of the EPA's involvement in small businesses.

Chairman Marjorie Taylor Greene, R-Ga., opened the morning hearing by placing modern climate intervention in a long tradition of weather control, from Native American rain dances to Cold War era military projects, but warned today's techniques of cloud seeding, carbon removal and blocking sunlight could pose unpredictable risks to human health and agriculture.

Greene argued that efforts to fight what she called a "climate change hoax" could lead to reckless global experiments.

"Some scientists think they can predict and control the impact of geoengineering, but even the best scientific models will never be able to capture all of God's wonderful creation and nature's mysteries," she said.

Some lawmakers warned of unchecked experimentation with climate interventions, and the administration has signaled it will not pursue new regulatory frameworks for geoengineering research, but instead emphasize transparency and voluntary disclosure.

This was solidified when a video of EPA Administrator Lee Zeldin was shared at the hearing. Zeldin explained his commitment to total transparency by promising to publicly release all geoengineering research so that "baseless conspiracies" will be met "head on."

On Friday, the agency proposed ending a rule that required about 8,000 facilities to publicly report their greenhouse gas emissions -- a program that provided transparency into the country's biggest polluters.

In the afternoon, the Subcommittee on Federal Law Enforcement looked at the EPA in a different light, focusing on what Republican lawmakers cited as an aggressive policy during the Biden administration.

"Instead of pursuing massive industrial polluters who employ highly paid legal defense teams, EPA under the Biden administration chose to focus on mom-and-pop shops, and with the shops that have limited means to argue their case against the legal might of the Department of Justice backed by the EPA," Chairman Clay Higgins, R-La, said.

He added: "Often, EPA's enforcement actions involved raids on shops by teams of armed EPA agents who intimidated small businesses with threats of criminal prosecution."

The committee showcased small businesses as examples of what GOP members called EPA's overreach, including one from Higgins' home state of Louisiana.

Kory Willis, owner and founder of Power Performances Enterprise Inc. of Baton Rouge, who runs a performance tuning shop, described an almost decade-long legal fight that culminated in a consent decree that nearly put him out of business.

According to an EPA press release in 2022, federal prosecutors described Willis' company as among the country's leading developers of "delete tunes" -- software that disables emissions controls in diesel trucks.

Court records show his company tuned more than 175,000 vehicles, moving over $1 million in products monthly at its peak, with emissions expected to release more than 100 million pounds of excess pollutants over the lifetime of those vehicles.

Another witness, Eric Schaeffer, former executive director of the Environmental Integrity Project and EPA Office of Civil Enforcement director, subtly questioned Willis in his testimony.

"If you're stuck behind a diesel truck, or a bunch of diesel trucks, in a traffic jam, and being showered with soot, live in an apartment next to a highway or the is city cooked by smog ... don't you have the right to breathe clean air? We used to think so," Schaeffer said.

In its press release, the EPA said "Diesel emissions include multiple hazardous compounds and harm human health and the environment. Diesel emissions have been found to cause and worsen respiratory ailments such as asthma and lung cancer. One study indicated that 21,000 American deaths annually are attributable to diesel particulate matter."

In March 2022, Willis and Power Performances Enterprise Inc. pleaded guilty to conspiracy and Clean Air Act violations, agreeing to pay $3.1 million in criminal fines and civil penalties and to stop selling defeat devices.

Schaeffer noted that the crackdown on defeat devices did not begin with the Biden administration.

"The launching of this enforcement initiative to crack down on the sale of these aftermarket devices started under the Trump administration in President Trump's first term," he said, pointing to EPA guidance at the time that warned of criminal penalties and urged companies to self-disclose violations.

Since then, federal courts have consistently upheld that the Clean Air Act covers aftermarket tampering devices.

Democratic members pushed back on the GOP positions, framing the hearing as not an examination of enforcement tools, but instead as part of the broader efforts for this administration to roll back environmental protections.

Rep. Summer Lee, D-Pa., highlighted the dismantling of environmental justice functions, warning that loosened oversight would leave vulnerable communities more exposed to soot, asthma and cancer.

For example, in July, the EPA announced it was dismantling its Office of Research and Development, the branch long responsible for the agency's core scientific work, laying off many staff.

A new Office of Applied Science and Environmental Solutions will replace it -- a change that EPA officials under Trump say will streamline research and save nearly $750 million.

Together, the hearings and EPA's actions indicated a present and future narrowing of the agency's enforcement reach, pulling back climate transparency rules and reframing scientific research.