WASHINGTON (AP) _ A new Energy Department analysis concludes emission of so-called greenhouse gases from cars, factories and power plants in the United States rose sharply last year, The Washington Post reported.

The paper notes in Monday's editions that release of the report Monday will put more pressure on the administration to devise a strategy for dealing with pollutants blamed for global warming.

It says the 3.4 percent increase in heat-trapping gas in 1996 is described as ``the highest rate of increase in years'' in the Energy Department document.

The Post said the report attributes the increase in part to a robust economy and higher natural gas prices that prompted a switch to dirtier forms of energy such as coal.

Another factor cited was unusually severe weather in some parts of the country that resulted in a 6.3 percent increase in residential heating bills.