• In this Feb. 25, 2015 file photo, dead fish and trash float in the polluted Guanabara Bay in Rio de Janeiro, Brazil. Olympic organizers have agreed to test for viruses in Rio’s sewage-filled waters. But even if they find high virus counts, organizers say they have no plans to move venues. (AP Photo/Leo Correa, File)

    Obstacle to moving Rio Olympic venues? 1,400 silent athletes

    RIO DE JANEIRO (AP) — Olympic organizers have agreed to test for viruses in Rio’s sewage-filled waters.

  • President Barack Obama delivers remarks at Kotzebue School, Wednesday, Sept. 2, 2015, in Kotzebue, Alaska. Obama is on a historic three-day trip to Alaska aimed at showing solidarity with a state often overlooked by Washington, while using its glorious but changing landscape as an urgent call to action on climate change. (AP Photo/Andrew Harnik)

    Obama visit puts spotlight on rough plight in rural Alaska

    KOTZEBUE, Alaska (AP) — President Barack Obama crossed the Arctic Circle on Wednesday in a first by a sitting U.S. president, telling residents in a far-flung Alaska village that their plight should be the world’s wake-up call on global warming.

    Updated: 10:08 pm

  • 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.

  • A Penguin runs out of the ocean after swimming with other penguins at Boulders beach a popular tourist destination in Simon's Town, South Africa, Thursday, Aug. 27, 2015.  The penguins on South Africa's west coast are a big tourist attraction, but their numbers have declined and scientists are still debating whether fishing has helped push the species to the brink of extinction. (AP Photo/Schalk van Zuydam)

    Scientists squabble while Africa’s only penguins perish

    CAPE TOWN, South Africa (AP) — They’re cute, knee-high, they bray like donkeys and are a tourist attraction near Cape Town. But African Penguins — the continent’s only species of the flightless bird — are at risk of extinction.

  • In this July 23, 2015 photo, Efrem Garza stands before his new home built on the lot of his previous house that was destroyed by Hurricane Katrina and holds a photograph taken by a friend of the remains of that house on South Seashore Avenue in Long Beach, Miss. Before the storm Garza was surrounded by houses and trees, now 10 years later, there are only two houses on that land, as few of the residents returned and rebuilt. (AP Photo/Rogelio V. Solis)

    On Mississippi’s shore, what Katrina erased not yet replaced

    LONG BEACH, Miss. (AP) — Between Mississippi’s seashore and the railroad tracks a little ways inland, where Hurricane Katrina all but erased a neighborhood 10 years ago, Efrem Garza and a handful of other homeowners are still resettling a frontier.