Allegations of bribery at Wal-Mart Stores' Mexican arm grabbed the headlines at the start of the week, rocking the world's largest retailer. Nestle, the world's largest food manufacturer, made waves of its own with its US$11.9bn deal to buy Pfizer's baby food business. The week also saw a raft of first-quarter results and the announcement of the latest results from Unilever's Sustainable Living Plan, a programme to reduce its impact on the environment. We met Unilever CEO Paul Polman to discuss the company's progress.