H&M’s latest collaboration isn’t one you’d expect. The Swedish high-street retailer is partnering with the World Wildlife Fund on a “game-changing” water-management plan to minimize its footprint. The three-year effort is as much a matter of corporate stewardship as it is self-interest. Nearly 2.7 billion people, or 40 percent of the world’s population, live in river basins that experience water scarcity during at least one month of the year, according to the environmental group’s 2012 Living Planet report. Roughly a third of the units responsible for H&M’s wet processes are situated in areas that are now, or will be by 2025, extremely dry.