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Che Guevara kicked around Baraka, in the Democratic Republic of Congo, in the 1960s. Now it is a thriving trading city – but still lacks a basic digital map. Guardian readers are setting out to change that
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San Pedro Sula, Honduras, is the most dangerous city on the planet – and experts say it is a sign of a global epidemic
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Vila Brasilândia, a slum city on the edge of São Paulo, has found unconventional ways to tackle urbanisation, resource scarcity and climate change
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A year on from launching lawsuits, slum dwellers are taking their demands for clean water, toilets and housing to the health ministry, writes Mark Anderson
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São Paulo is changing its approach to tackling drug addiction. Hospitalisation and police interventions have given way to a programme that provides food, housing and jobs for addicts
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São Paulo’s Open Arms programme offers crack addicts a controversial route to rehabilitation, providing work and housing but not requiring them to give up drugs. Sarika Bansal reports
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