Australian Broadcasting Corporation: Australia’s food productivity is declining along with agricultural r&d, undermining the country’s ability to help feed the world, says one expert. In the current issue of Australasian Science, agricultural economist Dr John Mullen, says the pattern is reflected in other developed countries such as the US and UK. "I’m pretty concerned about what’s happening," says Mullen, an adjunct professor at Charles Sturt University. "We’ve got to feed another 3 billion people in …