Officials tell The Associated Press that the Environmental Protection Agency has concluded greenhouse gases are endangering people's health and must be regulated.
The EPA will announced its findings at a news conference Monday.
The announcement is timed to boost the Obama administration's arguments at an international climate conference - beginning this week - that the United States is taking actions to combat global warming, even though Congress has yet to act on climate legislation.
Under a Supreme Court ruling, the so-called endangerment finding is needed before the EPA can regulate carbon dioxide and five other greenhouse gases released from power plants, factories and automobiles under the federal Clean Air Act.
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