Contents of the latest issue: EDITORIAL FEATURE: Urban farming SUSTAINABILITY SCHOOL "The tortilla effect" IN BRIEF: Food crisis worsened by invasive species "Costly and unethical not to curb climate change" The world is complex - deal with it! Kongo includes healers in national health strategy "Global warming afects all, but differently" Environment and social instability strongly linked Wildfires are increasing as a result of climate change Black soil is the new green SDU-NUMBERS The quote