Record rains in southern Brazil have displaced almost 600,000 people. Some will never get to go home. A vast area, including the wealthy city of Porto Alegre, remains saturated a month after devastating storms. President Luiz Inacio Lula da Silva has declared it a “climate catastrophe.” Officials triaging overlapping humanitarian and economic crises are writing off whole neighbourhoods – telling residents these places can never be made safe.

Caitríona Perry speaks with BBC Brasil reporters Daniel Gallas and Leandro Prazeres, who have been finding out what this means for people in the flood zone, and asks if there are lessons for all of us in a warming world.

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This episode was made by Neal Razzell and Eleanor Sly. The technical producers were Gareth Jones and Phil Bull. The assistant editor is Sergi Forcada Freixas and the senior news editor is Sam Bonham.