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On a bright September day on the harbor in Copenhagen, several hundred people gathered to welcome the official arrival of Laura Maersk.Laura was not a visiting European dignitary like many of those in attendance. She was a hulking containership, towering a hundred feet above the crowd, and the most visible evidence to date of an effort by the global shipping industry to mitigate its role in the planet’s warming.The ship, commissioned by the Danish shipping giant Maersk, was designed with a special engine that can burn two types of fuel — either the black, sticky oil that has powered ships for more than a century, or a greener type made from methanol. By switching to green methanol, this single ship will produce 100 fewer tons of greenhouse gas per day, an amount equivalent to the emissions...

The United Automobile Workers and Ford Motor have reached a tentative agreement on a new four-year labor contract, the union announced Wednesday, nearly six weeks after the union began a growing wave of walkouts against the three Detroit automakers.The union said the deal included a roughly 25 percent pay increase over four years, cost-of-living wage adjustments, major gains on pensions and job security, and the right to strike over plant closures. It called on striking Ford workers to go back to work while the tentative agreement awaits ratification.Shawn Fain, the union president, said in a livestream on Facebook that the accord would be submitted to the U.A.W. council that oversees relations with Ford at a meeting in Detroit on Sunday. If the council approves, the union will submit the ...