Hundreds of people will tell the Environmental Protection Agency what they think of proposed rules to cut pollution from power plants during public hearings Tuesday and Wednesday in Denver.

With just five minutes each to make their case to the EPA, opponents and supporters also are staging rallies around the city.

The EPA is holding hearings this week in Denver, Atlanta, Pittsburgh and Washington on President Barack Obama's plan to cut carbon dioxide emissions by 30 percent by 2030, with 2005 levels as the starting point.

The rules are intended to curb global warming.

Coal mines, electric utilities, labor unions, environmental groups, renewable energy companies, government agencies and religious and civil rights organizations are sending representatives to the Denver hearings.

Mark Fix, a Montana rancher signed up to speak Tuesday, called the rules a "good step in the right direction." He blames climate change for a tornado, flooding and other extreme weather he has witnessed on his ranch.

"There's things out there we need to develop — the hydro, the wind, the solar, a lot of the renewables," Fix said Monday. Fix ranches southwest of Miles City, Montana, and is a member of the Northern Plains Resource Council.

Jonathan Downing, executive director of the Wyoming Mining Association, plans to argue against the rules.

"I think they need to go back to the drawing board," Downing said Monday. "It takes time to develop those (anti-pollution) technologies and have conversions on power plants," and U.S. competitiveness could suffer during the transition, he said.

Wyoming is the nation's No. 1 coal state, producing nearly 40 percent of the U.S. total, according to the National Mining Association.

EPA technical experts will listen to the comments, and a transcript will go into the EPA record, agency spokeswoman Lisa McClain-Vanderpool said. The EPA plans to release the final rules next year.

The agency expects 400 people to speak in Denver and a total of 1,600 in all four cities. Written comments will be accepted until Oct. 16.

Former EPA Administrator Christine Todd Whitman said hearing testimony can range from serious questions to political theater.

"People ask some ridiculous ones which means that they don't care about the answer," said Whitman, a former New Jersey governor who headed EPA from January 2001 to June 2003.

But the hearings are a legitimate part of the EPA decision-making process, she said.

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Online:

Guidelines to submit written comments to the EPA: http://tinyurl.com/qetmzaj

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