An oil spill off China’s coast is the world’s biggest since Deepwater Horizon — and it more than …

An Iranian oil tanker carrying 122,000 tons of oil sank after it collided with a Hong Kong-based tanker in the East China Sea. The collision caused an explosion that sent thousands of tons of oil spilling into the ocean. The tanker was carrying condensate, a type of ultra-light crude oil that is more difficult to …