APL flipped the switch today on a clean-air effort that’s part of California’s maritime future. The Singapore-based container shipping line became the first to shut down, or, “cold-iron,” a vessel’s engines to eliminate exhaust emissions at the Port of Oakland. As others follow suit – and regulators say they must – cold-ironing will become a staple on California’s coast. “We have brought cold-ironing to the port,” proclaimed APL Americas President Gene Seroka. The 900-foot APL…