In our final theme, we talk to Brazilian philosopher and Indigenous rights activist Ailton Krenak, who advocates living radically, without compromise, about life in Rio Doce six years after the Mariana dam disaster. Writer Anna Souter investigates how the healing properties of the sun influenced Modernist medicine, literature and architecture; Elizabeth Mrema, executive secretary of the Convention on Biological Diversity, calls for action at the UN Biodiversity Conference; and Indonesian photographer Atikah Zata Amani documents how the country’s urban farming communities are fighting for survival in the face of industrial development.