Procter & Gamble claims that nearly 5 billion people use it products, among them the anti-dandruff shampoo Head & Shoulders. But what's not so squeaky clean is that P&G is making those billions of consumers unknowingly part of an environmental scandal.

Greenpeace today reveals the result of a year-long investigation showing P&G is sourcing palm oil from companies connected to widespread forest devastation. Its sourcing policies also expose its supply chain to forest fires and habitat destruction that is further pushing the Sumatran tiger to the edge of extinction.