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Since 1958, researchers have been measuring the amount of carbon dioxide in the atmosphere at the Mauna Loa Observatory. The remote outpost has just reported a carbon dioxide level of 400 parts per million — the highest it has climbed in the modern age.

Actually, fresh fish doesn't smell "fishy," says Joe Palca. He spent a recent morning watching Hawaii's fishermen sell some 50,000 pounds of catch on the auction floor and sends this postcard.

The U.S. Navy is planning to expand training exercises off California and Hawaii, citing the need for military readiness. That's raising concerns about threatened whales and marine mammals, because sonar is known harm and, in some cases, kill them. The state of California is fighting the Navy's plan.

Vietnam has sent what analysts believe could be the remains of a member of the American military who died in the country during the Vietnam War. After a repatriation ceremony at the airport in Da Nang Sunday, the remains were sent to Hawaii for examination and possible identification.

Off the Hawaiian island of Oahu, Isaac Brumaghim was reeling in a tuna when a tiger shark grabbed the fish. "It definitely was an adrenaline rush for me," Brumaghim said afterward. Watch what happened.

In 2007, a young woman lost her camera scuba diving off Hawaii. It was found last week by a China Airlines employee thousands of miles away on a beach in Taiwan. China Airlines offered the owner a free ticket to come pick up the camera — the memory card still has pictures on it.

Pyongyang says its artillery and ballistic missile units are in full "combat posture" for a possible strike against South Korea or American bases in Guam, Hawaii and the U.S. mainland.

Also: English town may ban apostrophes on street signs; feminist romance novels; and Marie Ponsot wins the Ruth Lilly Poetry Prize.

With only about 1,000 full-blooded Hawaiians left in the world, preserving native island culture is a huge challenge. One way to do this: teach students and other island residents the ancient art of making poi, a dish that's been feeding native Hawaiians for centuries.

A chicken's close inspection of a transformer caused a power outage and brief delays at Maui's Kahului Airport this week. After the incident in the airport's rental car area, security screenings were performed manually and passengers had to use mobile stairways on the tarmac.