Obama, GOP Debut Dueling Energy Ads
White House Rivals Face Off in Fight for Environmental Vote
"Our coal reserves are larger than Saudi Arabia's supply of oil," McCain said.
According to experts, the actual use of clean coal will take far more of a government investment than the $2 billion a year McCain has proposed.
"It's very costly, so it does require a lot of government support to get it up and running," said Divya Reddy of the Eurasia Group.
When it comes to biofuels, such as ethanol, Obama is more bullish than McCain, wanting to spend billions on the investment in advance.
During an event in May, Obama pledged to set a goal to produce the first 2 billion gallons of advanced biofuels by 2013.
"The technology is just not there right now to make it commercial on the scale that everyone is envisioning," Reddy said. "It seems Obama's goal is fueled by hope and not science."
ABC News' Avery Miller and Sunlen Miller contributed to this report.
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