Iranian President Hassan Rouhani pauses before delivering the country's draft budget to the parliament speaker at the parliament in Tehran, Iran, Sunday, Dec. 7, 2014. (AP Photo/Vahid Salemi)

Confidential U.N. report positive on Iran nuclear commitments

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Obtained by The Associated Press, the confidential International Atomic Energy Agency report said more than four tons of the enriched uranium had been fed into a pipeline that ends with conversion of it into oxide, which is much less likely to be used to make nuclear arms.
An Iranian man walks past a mural displaying the Iranian map adorned in the colours of the country's national flag, on June 29, 2015 in Tehran. Despite agreeing the outlines of a nuclear agreement on April 2, the final talks between Iran and six powers led by the United States on turning it into a binding accord have hit difficulties on reaching a deal which would lift sanctions, paving the way for foreign investment to flow back, in exchange for curbs on Iran's nuclear activities. AFP PHOTO/BEHROUZ MEHRIBEHROUZ MEHRI/AFP/Getty Images

Iran faces slow road back to oil market even with nuclear deal

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The U.S. and five other global powers seek an agreement with the Persian Gulf nation to curtail its nuclear program in exchange for removing sanctions that have squeezed its oil trade and economy.
Russ Girling, President and CEO of TransCanada Corporation, speaks at a press event at the pipe yard for TransCanadaÕs Houston Lateral Project in Mont Belvieu, Texas, about 30 miles east of Houston on Wednesday, March 5, 2014. (Bloomberg Photo/Scott Dalton)

TransCanada touts carbon reduction programs in latest Keystone push

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The controversial Keystone XL pipeline, which would directly link the oil sands of Alberta to a midwestern U.S. oil hub, has been awaiting the presidential authorization it needs to cross the border for seven years.
(AP Photo/U.S. Geological Survey, S.A. Sonsthagen)

Obama administration delivers big blow to Shell’s Arctic drilling plans

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The Fish and Wildlife Service said it could not authorize sound from Shell’s planned drilling of wells roughly nine miles apart to disturb walruses in the Chukchi Sea, because a 2013 requirement mandates a 15-mile buffer zone.
FILE - This Sept. 30, 2014 file photo shows the Colstrip Steam Electric Station operated by Talen Energy in southeastern Montana. Coal companies and their supporters scored a courtroom victory with a U.S. Supreme Court decision that said the Obama administration failed to take potential costs into account when it decided to regulate toxic emissions from many power plants, Monday, June 29, 2015. (AP Photo/Matthew Brown, File)

After mercury ruling, scrutiny of Obama climate rules grows

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The high court’s ruling undermined Obama administration regulations targeting mercury and other hazardous air pollutants — a different set of regulations from the greenhouse gas limits that Obama is counting on to slow the effects of global warming.
NRG Energy Inc. Vice President Nuclear Oversight, James von Suskil speaks during a scheduled refueling outage on Unit 2 at the South Texas Project nuclear power facility Thursday, April 2, 2015, in Wadsworth.
(James Nielsen / Houston Chronicle)

Some Texas power companies already spent billions on EPA compliance, before Supreme Court ruling

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Many companies have already spent the money to retrofit or shut down the coal-fired power plants that were most affected. Other Texas power companies rely more on natural gas or nuclear power and actually supported the Environmental Protection Agency rule that went into effect in April.
The Polar Pioneer, a drilling rig contracted by Shell for Chukchi Sea exploration in 2015, is transported across the Pacific on the heavy-lift vessel Blue Marlin. (Photo: Vincenzo Floramo / Greenpeace)

Sea ice could keep Shell away from the Arctic until mid July

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Even if Shell wins all federal permits to drill in the Chukchi Sea this summer, sea ice could block it from launching the work until late July.
Opponents of hydraulic fracturing for natural gas, or fracking, demonstrate on the campus of Binghamton University hours before President Barack Obama is scheduled to speak about affordable college education during a town hall meeting, Friday, Aug. 23, 2013, in Vestal, N.Y. Obama is on a the second day of his two-day bus tour in upstate New York and Pennsylvania. (AP Photo/Mike Groll)

New York formalizes ban on fracking, ending seven-year review

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Department of Environmental Conservation Commissioner Joe Martens announced the decision Monday, saying a ban was the “only reasonable alternative” after “years of exhaustive research and examination of the science and facts.”
FILE - In this April 11, 2015, file photo, U.S. President Barack Obama, right, and Brazilian President Dilma Vana Rousseff shake hands during their bilateral meeting at the Summit of the Americas in Panama City, Panama. Rousseff visits Washington and will meet with Obama on June 29 and 30. (AP Photo/Pablo Martinez Monsivais, File)

Climate top item for Obama sit-down with Brazil leader

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The meeting comes six months before world leaders gather at a United Nations-sponsored conference in Paris in December to finalize a climate treaty. Obama has argued that a gradually warming planet could worsen social tensions and political instability worldwide, in addition to harming the U.S.
Tar is removed from the coastline that remained closed on Thursday, June 4, 2015, in Long Beach, Calif., after tar balls washed ashore. (Allen J. Schaben/Los Angeles Times/TNS)

Plains All American lab tests show oil from pipeline spill spread along hundreds of miles of California coastline

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Houston-based Plains All American Pipeline released a summary of the lab tests on Friday, as state and federal lawmakers intensified their scrutiny of the company’s ruptured Line 901 and the oil spill near Santa Barbara last month.