The risks of crop failure in several global breadbaskets have been underestimated, according to a study on Tuesday that researchers said should be a "wake-up call" about the threat climate change poses to our food systems. Food production is a key source of planet-warming emissions and is also highly exposed to the effects of climate change , with climate and crop models being used to figure out what the consequences of global warming might be.  In new research published in Nature Communications Researchers in the United States and Germany have focused on the likelihood that several large food-producing regions could suffer from low yields simultaneously. (Kelly MACNAMARA, PHYS.ORG)