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en español"Rice is arguably the world's most important food source and helps feed about half the globe's people. But yields in many areas will drop as the globe warms in future years, a review of studies on rice and climate change suggests... Predicting how a changing climate will affect crop yields is notoriously difficult. Temperature, carbon dioxide concentration and ozone levels all have a big impact on growth. Yet most studies look at just one of these factors, making it difficult to know what the combined effect will be. It is also hard to know whether results from experiments in greenhouses with artificial climates will hold true in the real world. But when the evidence from some 80 different studies is combined, the outlook is bleak, says Elizabeth Ainsworth of the University of Illinois, Urbana-Champaign."
Full Story: http://environment.newscientist.com/article/dn13517-major-food-source-threatened-by-climate-change.html