New Scientist: African farmers will soon face growing seasons hotter than any in their experience. To cope with this rapid climate change, they “” and the plant breeders who supply their crops “” will need to make big changes, and soon. Agricultural experts have predicted for some time that farmers are likely to face problems as climates become hotter and drier than they are today. Indeed, some farmers in South Africa are already reporting difficulties (pdf). To see how fast, and how broadly, …