A coalition of U.S. biotechnology firms, farm groups and grains traders last week made a renewed call on President Obama to press China to create a more predictable system for approving and allowing imports of genetically modified crops, with a warning that incremental progress on the issue made last winter is in danger of being reversed. In separate but similarly worded letters , the U.S. Biotech Crops Alliance and several dozen regional organizations urged Obama to use his upcoming summit...