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WASHINGTON (AP) -- Revising his stance on global warming, President Bush will propose a new target for stopping the growth of the nation's greenhouse gas emissions by 2025.

The president also will call Wednesday for putting the brakes on greenhouse gas emissions from electric power plans within 10 to 15 years, according to a senior administration official familiar with the afternoon speech Bush will deliver in the Rose Garden.

The official spoke on condition of anonymity in advance of the speech.

Bush is not going to outline a specific proposal, but he'll lay out a strategy for ''realistic'' emission reduction targets and ''principles'' he thinks Congress should follow in crafting global warming legislation.

The new goal for curtailing greenhouse gas emissions is an attempt to short-circuit what White House aides call a potential regulatory ''train wreck'' if Congress doesn't act on climate change. The president's speech is aimed at shaping the debate on global warming in favor of solving the problem while avoiding heavy costs to industry and the economy.

The Bush administration has been a staunch opponent of a mandatory so-called ''cap-and-trade'' approach to reducing greenhouse gases. While it has backed some mandatory programs, it has preferred largely voluntary measures to broadly address global warming. In his speech, however, the president will not slam the door on discussing market-based approaches to stem the rise in greenhouse gas emissions.

''We aren't necessarily against cap-and-trade proposals,'' White House press secretary Dana Perino said earlier this week. But she added quickly, ''What we've seen so far from Congress is not something that we can support.''

The president remains opposed to a Senate bill that would require mandatory caps on greenhouse gas emissions, calling that proposal unrealistic and economically harmful, Perino said.

Bush will speak forcefully about concerns he has over a possible rush to address the Earth's warming through a hodgepodge of regulations under existing federal laws such as the Clean Air Act and the Endangered Species Act.

Senior White House officials last week told a group of conservative Republican lawmakers in a private meeting that the administration wants Congress to act on climate change to avoid regulating carbon dioxide and other heat-trapping -- or greenhouse -- gases under existing laws.

Perino says the administration is concerned about a potential regulatory ''train wreck'' as a result of climate-related court rulings.

''Recent court decisions hold the very real prospect that the federal government will regulate greenhouse gas emissions with or without a new law being passed,'' Perino said. ''To us, having unelected bureaucrats regulating greenhouse gases at the direction of unelected judges is not the proper way to address the issue.''

Several of the conservative GOP lawmakers who heard the White House presentation last week said they viewed it as a move toward endorsing a limited type of ''cap-and-trade'' emissions reduction proposal, targeting power plants, and a reversal of long-standing administration climate policy.

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