Thirty-two energy companies led by Russia's Gazprom account for almost a third of all man-made greenhouse gas emissions if the burning of all the coal, oil and gas they produce is taken into account, a study said on Wednesday.

• May 20, 2015

Oil prices fell more than 3 percent on Tuesday, with U.S. crude extending losses for a fifth straight day, as the dollar rallied amid evidence that the United States and top oil exporter Saudi Arabia were pumping more than the world needed.

• May 19, 2015

Iran is prepared for "all scenarios" in talks with world powers about curbing its nuclear program in exchange for sanctions relief, its top nuclear negotiator said on Friday when asked what would happen if no final deal was reached by July.

• May 15, 2015

The U.S. Senate voted overwhelmingly on Thursday to pass a bill giving Congress the right to review, and potentially reject, an international nuclear agreement with Iran.

• May 7, 2015

Washington wants to be certain that any nuclear deal between Iran and major powers includes the possibility of restoring U.N. sanctions if Tehran breaks the agreement without risking Russian and Chinese vetoes, a senior U.S. official said on Tuesday.

• May 6, 2015

Italian refiner Saras (SRS.MI) and Russian energy giant Rosneft (ROSN.MM) have called off plans to set up a trading joint venture, Saras Managing Director Dario Scaffardi said on Tuesday.

• April 29, 2015

The next generation of nuclear reactors being developed in countries such as France, Russia, China and Japan may not be safer than those being built today, French nuclear safety watchdog IRSN said on Monday.

• April 28, 2015

The next generation of nuclear reactors being developed in countries such as France, Russia, China and Japan may not be safer than those being built today, French nuclear safety watchdog IRSN said on Monday.

• April 27, 2015