Ridurre le emissioni di CO2 sarà il tema forte al prossimo vertice ONU di Parigi, anche per lottare contro l'inquinamento nelle grandi città. Un problema globale che una città sudamericana ha iniziato ad affrontare in modo innovativo. Medellin, in Colombia, una città fino a quindici anni fa fra le più sporche e pericolose al mondo, oggi è un esempio di città virtuosa che ha recuperato i luoghi più poveri e malfamati trasformandoli in quartieri modello.
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