When Rolf Peterson landed on Isle Royale this year for the annual tracking of gray wolves, he flew over the remote island in Lake Superior for hours, day after day — but saw none. Fifteen days passed before Peterson and his research crew spotted three resident wolves on the island, Michigan's only national park. They were the only three spotted this season — down from nine wolves the previous season, and the fewest in a 57-year study. (Detroit News)

State officials are announcing Wednesday a $75 million settlement with Enbridge Energy to finalize cleanup terms with the Canadian pipeline owner responsible for 2010's massive Kalamazoo River oil spill. The agreement comes five years after an underground pipeline near Marshall ruptured, releasing more than 800,000 gallons of heavy crude oil into a nearby creek and, eventually, the river. It was the largest inland oil spill in U.S. history, which has some environmental groups questioning if the settlement goes far enough. (Detroit News)

Experts say Michigan’s honey bee population is down by about 30 percent from last year. They say the species responsible for pollinating about one-third of the human diet has been having a tough time making it through the recent harsh winters. (WDET)

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Local environmental groups could take the Palisades Nuclear Power Plant to court this spring. The organizations say the aging plant near South Haven wants to lower its safety standards to keep running past its latest expiration date of 2017.

The alewife and salmon populations in Lake Michigan are on the brink of serious changes. Researchers have observed record low levels of alewives this year. (WDET)