"Zero tolerance" is the only way to approach the issue of human trafficking and slavery in supply chains. But how can companies make that happen?

High above the red dirt and evergreen trees of Kemper County, Mississippi, gleams a 15-story monolith of pipes surrounded by a town-sized array of steel towers and white buildings. The hi-tech industrial site juts out of the surrounding forest, its sharp silhouette out of place amid the gray crumbling roads, catfish stands and trailer homes of nearby De Kalb, population: 1,164.

China is cracking down on pollution like never before, with new green policies so hard-hitting and extensive they can be felt across the world, transforming everything from electric vehicle demand to commodities markets.