Guardian: Financial speculators have come under renewed fire from anti-poverty campaigners for their bets on food prices, blamed for raising the costs of goods such as coffee and chocolate and threatening the livelihoods of farmers in developing countries. The World Development Movement (WDM) will issue a damning report today on the growing role of hedge funds and banks in the commodities markets in recent years, during which time cocoa prices have more than doubled, energy prices have soared …