In this articleULVR-GBMKCWMTNES.N-CHOn any given day, 2.5 billion people use Unilever products that span 400 brands. That success has created a huge target on the company's back as the sustainability movement gains more traction with consumers shunning plastic pollution.Sajjad Hussain | AFP | Getty ImagesUnilever's plan to merge its food business with spice maker McCormick is the latest move in a sector that's fighting to stay relevant as the growth model that has powered big consumer products companies for ...