SciDev.Net: New varieties of drought-tolerant maize could deliver a US$1.5 billion gain in food and income in Sub-Saharan Africa as well as helping smallholders cope with the effects of climate change, according to a study carried out in 13 countries in the region. Researchers at the International Maize and Wheat Improvement Center (CIMMYT), Mexico, and the International Institute of Tropical Agriculture (IITA), Nigeria, said the varieties produce yields up to 50 per cent higher than commercial …