In Rio Grande do Norte, on Brazil’s northeastern tip, a vast rainforest has been diminished to small patches to make way for agricultural land. The Atlantic Rainforest — or Mata Atlântica — used to stretch from this region into southern Brazil, Paraguay and Argentina, but less than 10% of it remains today. Although Rio Grande do Norte is the fifth-smallest Brazilian state by land area, it supplies 70% of the nation’s melons and is famed for its mango and cashew fields.