WASHINGTON — Officials said the Environmental Protection Agency concluded greenhouse gases are endangering people's health and must be regulated.

The EPA will announce its findings today at a news conference.

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.

By The Associated Press