Bananas are one of the most popular fruits on the planet - more than 100 million tonnes of them are eaten every year. But on banana plantations on four continents, a deadly fungus is creeping through the soil and destroying the plants. Some say the end is nigh for the banana. But from Australia to Colombia and from the Philippines to the Netherlands, work is going on to stop that happening. We meet the farmers, scientists and gene technologists trying to find a way to save the fruit. Reporter: Daniel Gordon (Photo Credit: BBC)