The study's findings are also likely to fuel debate over the efficacy of genetically modified crops, which some scientists have argued may be needed in future to feed the rapidly growing global population, which is expected to reach at least 9 billion by 2050. ผลของการศึกษา
Deepak Ray, who led the new research, said that some countries were faring far worse than others. For instance, in Guatemala, the productivity of the maize agriculture is declining, while the population is growing.