Most of the clothing and gadgets you buy in stores today were once in shipping containers, sailing across the ocean. Ships carry over 80% of the world’s traded goods. But they have a problem – the majority of them burn heavy sulfur fuel oil, which is a driver of climate change. While cargo ships’ engines have become more efficient over time, the industry is under growing pressure to eliminate its carbon footprint. European Union legislators reached an agreement to require an 80% drop in shipping fuels’ greenhouse gas intensity by 2050 and to require shipping lines to pay for the...