Global warming is already hitting Africa. This is increasing the vulnerability of poor communities, especially farmers, who are having to cope with not only more droughts but also sudden, violent and unpredictable rainfall. "Africa - Up in Smoke?" is the second report from the Working Group on Climate Change and Development. It has a foreword by Archbishop Desmond Tutu, and draws attention to the fact that climate change is a particular challenge for Africa, where many of the world's poorest countries are located.