Small Farms in China (IMAGE) University of Arizona Caption The 30 million hectares of small farms in northern China include a patchwork of fields planted with cotton genetically engineered to produce an insect-killing protein and "refuges" of other crops that do not make such proteins. Credit Ming Zhang, Microfotos Usage Restrictions This image may only be used in the context of this news release. Credit must be included as indicated. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.