Environment

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National Edition News cover for July 10, 2015 - Support for lifting U.S. ban on oil exports growing: Studies from Harvard and the GAO show that lifting a ban on exporting oil from the U.S. would lower domestic gasoline prices. Democrats have joined Republicans to push for overturning the export ban. (Associated Press)

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Potential GOP presidential candidate Wisconsin Gov. Scott Walker drew praise from social conservatives for his plan to sign a 20-week abortion ban. (Associated Press)

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The Congressional Progressive Caucus is scheduled to host a forum Wednesday drawing parallels between the tobacco and fossil fuel industries in support of a coordinated effort to use the legal system to pursue climate change dissenters. (Associated Press/File)

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In this Oct. 17, 2007, file photo, Kiger Mustangs from the Kiger Management Area near Diamond in southeast Oregon are shown. Wild horse advocates are challenging U.S. Bureau of Land Management plans to round up the famous Kiger and Riddle Mountain mustang herds in eastern Oregon, arguing that the roundup is designed to breed a master race of wild horses exhibiting old Spanish bloodlines, violating the intent of the law protecting wild horses. (Jamie Francis/The Oregonian via AP, file) MANDATORY CREDIT

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Buck/Hood Hoodlum Knife - This is the ultimate survival knife. It can help you survive in extreme outdoor conditions. Its handle is built with a Shock Mitigation System (SMS), which alleviates shock and wasted energy. It also has a groove cut into the blade spine, which can be used to score bone, bend wire, or remove pots from a campfire. This knife will serve all of your survival needs!

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Sales of 3-D printers are expected to double to 217,000 this year. The Defense Department is testing how they can help soldiers in the field by "printing" food, medicine and weapons, and is even exploring the ideas of printing antennas and warheads. (Associated Press)

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bailout: Greek Prime Minister Alexis Tsipras (left) hopes to work out a rescue deal with European leaders to save his country's economy.

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overdrawn: Greek pensioners enter a bank to withdraw a maximum of 120 euros — $134 — in Athens Tuesday as the country's financial situation remains precarious. (Associated Press photographs)

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Former Texas Gov. Rick Perry. ** FILE **

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Hillary Clinton's communications director, Jennifer Palmieri, hit back at criticism over the media's limited access to the Democratic presidential candidate, despite reporters being corralled at a distance during her appearance at a New Hampshire parade. (MSNBC) ** FILE **

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This photo provided by Paramount Pictures shows, Arnold Schwarzenegger as the Terminator in "Terminator Genisys," from Paramount Pictures and Skydance Productions. (Melinda Sue Gordon/Paramount Pictures via AP)

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South Carolina Gov. Nikki Haley, center, is applauded during a news conference in the South Carolina State House, in Columbia, S.C., in this June 22, 2015, file photo. Haley said that the Confederate flag should come down from the grounds of the state capitol, reversing her position on the divisive symbol amid growing calls for it to be removed. (Tim Dominick/The State via AP, File)

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Exiled Tibetan spiritual leader Dalai Lama delivers a speech at the ESS Stadium in Aldershot, southern England, on June 29, 2015. The Dalai Lama is celebrating his 80th birthday with a three-day Global Compassion Summit at the University of California, Irvine July 5-7 that will include talks about climate change, the importance of compassion and the presentation of an 8-foot-tall gold-and-maroon birthday cake for His Holiness. (AP Photo/Matt Dunham, File)

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FOR RELEASE SATURDAY, JULY 4, 2015, AT 12:01 A.M. CDT. - This photo taken June 26, 2015, shows Phil Hoechst, brewmaster at Hop Haus Brewing Co. in Verona, checking a batch of beer brewing in his three-barrel brewing system. He also has four three-barrel fermentation tanks, with room for more if needed. (Barry Adams/Wisconsin State Journal via AP)

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NASA's Armstrong Flight Research Center is working on a plan to send a specialized drone to Mars. The space agency plans to send the aircraft to the Red Planet by the 2020s. (Image: NASA) ** FILE **

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Emergency personnel stand by as evacuees gather at the Foothills Mall early Thursday, July 2, 2015, in Maryville, Tenn., after they were forced to leave their homes when rail car carrying a flammable and toxic gas derailed and caught fire. (Brittany Bade/WBIR.com via AP)

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FILE - In this Nov. 6, 2007, file photo, a polar bear mother and her two cubs are seen in Wapusk National Park on the shore of Hudson Bay near Churchill, Manitoba. About a third of the world's polar bears could face imminent threat from greenhouse gas emissions in as soon as a decade, according to a new report by the U.S. Geological Survey released Tuesday, June 30, 2015. The effects of diminished sea ice will lead to population declines throughout the century, and scientists didn't see a rebound in population numbers from the modeling that went up to the year 2100, according to the report. (Jonathan Hayward/The Canadian Press via AP, File) MANDATORY CREDIT

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Indiana Gov. Mike Pence told President Obama that his state will not comply with environmental regulations that raise residential electricity rates. (Associated Press)

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In this Friday, June 26, 2015, photo, different varieties of marijuana flowers are displayed at medical marijuana dispensary Kaya Shack in Portland, Ore. (AP Photo/Gosia Wozniacka)