Agence France-Presse: By mid-century, climate change may have outrun the ability of Africa’s farmers to adapt to rising temperatures, threatening the continent’s precarious food security, warns a new study. Growing seasons throughout nearly all of Africa in 2050 will likely be “hotter than any year in historical experience,” reports the study, published in the current issue of the British-based journal Global Environmental Change. Six nations — Senegal, Chad, Mali, Burkina Faso, Niger and Sierra …