Waitrose, the UK retailer, hit the headlines this week with its plans to further expand into the convenience sector. Elsewhere, on the ethical and organic front, the UK's Organic Trade Board drew up a plan to expand the organic market over the next six years. And, at the International Dairy Federation's World dairy Summit in Berlin this week, the global dairy industry threw its support behind a plan to reduce the sector's carbon emissions in a bid to tackle climate change. Here are the top stories on just-food this week.