Exelon, the electric company based in Chicago, will promise on Tuesday to cut greenhouse gas emissions by 2020 by an amount larger than its total emissions in 2008, in a bid to shape the debate on carbon dioxide rules and to get a jump on compliance.

Aldo DeRubeis bought compact fluorescent bulbs on Monday at the Home Depot in New Rochelle, N.Y. Sales of compact fluorescents climbed to 75 million last year for the retailer. Recycling them is about to get easier. Home Depot, the nation's second-largest retailer, will announce on Tuesday that it will take back old compact fluorescents in all 1,973 of its stores in the United States, creating the nation's most widespread recycling program for the bulbs.

The world's top oil producers and consumers convene in Jeddah, Saudi Arabia tomorrow to grapple with record high oil prices, with some OPEC members baulking at consumer demands for more crude. While Saudi Arabia, the world's biggest oil exporter, was widely expected to announce an output hike at the meeting, OPEC president Chakib Khelil slammed consumer pressure for a production increase to take pressure off soaring prices. "To ask the oil producers to increase their output is illogical and irrational," Khelil was quoted as saying today by the Algerian news service APS.

Faced with enormous political pressure to tighten the oversight of energy trading, federal regulators said Thursday that they have been investigating oil and derivative markets for six months to look into potential price manipulation. The revelation came as the agency, the Commodity Futures Trading Commission, also announced a series of measures intended to heighten regulatory supervision of energy trading and bring "greater sunshine' into the commodities markets.

The International Atomic Energy Agency, in an unusually blunt and detailed report, said Monday that Iran's suspected research into the development of nuclear weapons remained "a matter of serious concern' and that Iran continued to owe the agency "substantial explanations.' I.A.E.A. and Iran (iaea.org)The nine-page report accused the Iranians of a willful lack of cooperation, particularly in answering allegations that its nuclear program may be intended more for military use than for energy generation.

With gasoline prices at record highs, a station in Nashville posted prices in terms other than dollars and cents on Sunday. Gasoline sells currently for $3.61 a gallon on average, AAA says. Oil jumped to another record on Tuesday, and the government said it expected gasoline prices to peak at a national average of $3.73 a gallon in June, just as the summer driving season kicks off. )

Carol E. MurphyThis week, through Friday, Carol E. Murphy will be taking questions about alternative energy choices for consumers, what New York City is doing to decrease its reliance on fossil fuels and how city dwellers can decrease their "carbon footprint.' Submit your question in the box below.

Two widely prescribed cholesterol-lowering drugs, Vytorin and Zetia, may not work and should be used only as a last resort, a panel of four cardiologists told an audience of more than 5,000 people at

The Food and Drug Administration said on Thursday that recent data show patients taking H.I.V. drugs from GlaxoSmithKline and Bristol-Myers Squibb may have increased risk of heart attack.

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