Sustainability is becoming ever-more crucial for food companies and, this week, the hot topic was palm oil. The WWF issued a report praising those who had moves to source greener palm oil - but castigated those who hadn't. Smart Choices, a US food labelling scheme devised to help consumers, was similarly rebuked for promoting fatty foods. And, all the while, executives from Fresh Del Monte Produce to Chiquita Brands International and Kellogg handed down their insights on the economic and business landscape.