USA Today: World hunger has ebbed slightly, but 925 million people still go to bed hungry because of weather volatility due to climate change and the failure of developed countries to invest in agriculture, a report today says. The proportion of people who are hungry changed little — from 14% in 2000 to 13.5% today — despite a pledge by world leaders to halve the problem by 2015, says the report by Oxfam America, an international relief and development group. The report says the decline is …