Guardian: UK supermarket price wars are wrecking lives in the developing world, according to a new campaign launched tomorrow by Consumers International (CI). Recent deep cuts in the price of pineapples on the British high street have inflicted unacceptable damage on those living and working on plantations in Costa Rica, the consumer group says. An investigation by Guardian Films [click for video], with funding from CI, has found a catalogue of environmental and social damage caused by …