• In this Saturday, Aug. 7, 2015 photo, day-hikers scramble over rocky boulders on the Appalachian Trail below the summit of Mt. Katahdin in Baxter State Park in Maine. The sharp rise in the number people using the Appalachian Trail is causing headaches for officials, who say they’re dealing with increasing problems along the 2,189-mile footpath. (AP Photo/Robert F. Bukaty)

    Hikers behaving badly: Appalachian Trail partying raises ire

    BAXTER STATE PARK, Maine (AP) — When Jackson Spencer set out to tackle the Appalachian Trail, he anticipated the solitude that only wilderness can bring — not a rolling, monthslong frat party.

  • In this March 29, 2006 photo, a skier poses for a photograph on Portage Lake in front of Portage Glacier, about 50 miles south of Anchorage, Alaska. The Portage Glacier, which is a major Alaska tourist destination near Anchorage has retreated so far it no longer can be seen from a multimillion-dollar visitors center built in 1986.  President Obama leaves Monday, Aug. 31, 2015 for a three-day visit to the 49th state in which he will speak at a State Department climate change conference and become the first president to visit the Alaska Arctic. There and even in the sub-Arctic part of the state, he will see the damage caused by warming, damage that has been evident to scientists for years. (Evan R. Steinhauser/Anchorage Dispatch News via AP, File)

    Global warming carving changes into Alaska in fire and ice

    ANCHORAGE, Alaska (AP) — Global warming is carving measurable changes into Alaska, and President Barack Obama is about to see it.

  • In this Aug. 26, 2015 photo, General Mills CEO Ken Powell talks about his company's plans for reducing greenhouse gases during an interview with The Associated Press in Golden Valley, Minn. The company's goal is reducing its greenhouse gas emissions 28 percent by 2025, not just within its own operations but all the way up its supply chain from suppliers. (AP Photo/Jim Mone)

    General Mills sets ambitious goal for greenhouse gas cuts

    GOLDEN VALLEY, Minn. (AP) — General Mills has set an ambitious goal of reducing its greenhouse gas emissions 28 percent by 2025 — not just within its own operations but from farm to fork to landfill.

  • Endangered pallid sturgeon stocked in Missouri River

    LINCOLN, Neb. (AP) — Wildlife officials are continuing their efforts to restore the endangered pallid sturgeon to the Missouri River.

  • IAAF Vice President and President elect  Sebastian Coe waits at a medal ceremony during the 506World Athletics Championships at the Bird's Nest stadium in Beijing, Saturday, Aug. 29, 2015. (AP Photo/Kin Cheung)

    The Latest: Shigetomo, Kim lead halfway through marathon

    BEIJING (AP) — The Latest from the IAAF world championships (all times local):

  • This 1982 photo provided by The National Park Service shows a park employee sitting on a rock in Calcite Lake at The Wind Cave National Park in the Black Hills of South Dakota. The underground lakes, which were discovered in the 1960s, aren't home to any animal life but prominent cave microbiologist Hazel Barton has discovered there is bacteria - albeit scant - in the lakes. Barton hopes to decipher how the bacteria survives and answer questions about how it interacted before multicellular organisms came along and perhaps find new sources of antibiotics. (The National Park Service via AP)

    Far below South Dakota, a cave holds pure, promising water

    WIND CAVE NATIONAL PARK, S.D. (AP) — Hundreds of feet beneath the Black Hills, a team of scientists and researchers snake through dark, narrow and silent corridors of ancient rock to reach their goal: what is thought to be some of the purest water on Earth.

  • In this Wednesday, Aug. 26, 2015 photo, Enid Letourneau looks from the deck of her cottage in Georgia, Vt., at the blue-green algae in St. Albans Bay on Lake Champlain. The town recently reduced the value of 34 homes along the shore by $50,000 each because of the algae, which can be toxic to humans and dogs. (AP Photo/Lisa  Rathke)

    Algae drives down property values on Lake Champlain

    GEORGIA, Vt. (AP) — The two cottages on the shore of Lake Champlain will someday be passed down to her children but Enid Letourneau worries the algae that turns the shoreline pea-soup green each August means they won’t amount to much of an inheritance.

  • Deer hunters can win chance to hunt Platte River valley

    LINCOLN, Neb. (AP) — Nebraska deer hunters can enter a lottery to win the chance to hunt in the Central Platte River Valley this fall.

  • Missoula air quality ‘very unhealthy,’ Griz expected to play

    HELENA, Mont. (AP) — The air quality in Missoula was rated “very unhealthy” Friday due to smoke from forest fires in the region. Under University of Montana’s athletic practice policy, student athletes would be restricted to activities that do not increase their breathing rate.

  • UPDATES CAPTION TO REFLECT JUDGE’S RULING THURSDAY - This June 11, 2015, photo shows a dry water ditch next to a corn field in Cordova, Md. A federal judge in North Dakota on Thursday, Aug. 27, 2015, blocked a new Obama administration, which would have given the U.S. Environmental Protection Agency and Army Corps of Engineers authority to protect some streams, tributaries and wetlands under the Clean Water Act. The rule was scheduled to take effect Friday. (AP Photo/Alex Brandon)

    EPA: Clean water rule in effect despite court ruling

    WASHINGTON (AP) — The Environmental Protection Agency says it is going forward with a new federal rule to protect small streams, tributaries and wetlands, despite a court ruling that blocked the measure in 13 central and Western states.