An unprecedented warm-up of the western Pacific Ocean -- scientists think that partially explains a drought that has caused havoc across much of the United States, southern Europe and southwest Asia. NPR's Richard Harris reports.
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Award-winning journalist Richard Harris has reported on a wide range of topics in science, medicine and the environment since he joined NPR in 1986. In early 2014, his focus shifted from an emphasis on climate change and the environment to biomedical research.