WASHINGTON — President Bush, stepping into the debate over global warming, plans to announce today a national goal for stopping the growth of greenhouse gas emissions over the next few decades.

In a speech in the Rose Garden, Mr. Bush will lay out a strategy for curbing emissions, the White House press secretary, Dana Perino, said yesterday. She did not disclose details of his announcement and would not say whether the president would propose any kind of mandatory cap on greenhouse gas emissions.

The president wants every major economy, including fast-growing nations such as China and India, to establish a national goal for cutting the emissions believed responsible for global warming.

In his remarks, Ms. Perino said, Mr. Bush will articulate a “realistic intermediate goal” for America. Mr. Bush will emphasize the importance of offering incentives to promote technology as an effective way to reduce green house gas emissions, she said.

Mr. Bush’s announcement is expected to go beyond what he said in 2002. Then, he set a goal of reducing the growth of greenhouse gas emissions, while taking into account economic expansion. His critics argued that would still allow actual emissions to rise as the economy grew. The White House search for a new climate proposal comes amid growing indication that mandatory action to address global warming is highly likely. At the same time, the administration is facing growing pressure to regulate carbon dioxide under the federal clean air law.