Ben & Jerry's [part of Unilever] is stepping up its commitment to ethical business, announcing Thursday that all its 58 flavors of ice-cream - sold in 39 countries around the world - will be sourced from fair trade certified products by the end of 2013. The pledge extends an existing commitment...to convert all its European products to fair trade standards by the end of 2011. Company co-founder Ben Cohen said that changing business practices in the first world to ensure suppliers in the developing world are not exploited "is really the only moral way to do business."...Harriet Lamb, the head of the Fairtrade Foundation, said the company had shown "real leadership" in its long-term ambition to engage with small produce suppliers around the world...[refers to Mountain Fruits]