Reuters: Up to a quarter of global food production could be lost by 2050 due to the combined impact of climate change, land degradation and loss, water scarcity and species infestation, the United Nations said on Tuesday. The fall-off will strike just as 2 billion more people are added to the world’s population, according to the U.N. Environment Program (UNEP), which says cereal yields have stagnated worldwide and fish catches are declining. In a new report, it said a 100-year trend of …