Visiting the city hosting the Cop30 conference brings with it questions about farming, tourism and sustainabilityIn an open-air market in the Brazilian city of Belém, I had a problem. It was breakfast time and I wanted a drink, but the long menu of fruit juices was baffling. Apart from pineapple (abacaxi) and mango (manga), I’d never heard of any of the drinks. What are bacuri, buriti and muruci? And what about mangaba, tucumã and uxi? Even my phone was confused. Uxi, it informed me, is a Zulu w...