An aerial view of algae pollution at the Pinheiros River in Sao Paulo, Brazil, taken on September 9, 2024. According to the Environmental Company of the State of São Paulo (Cetesb), the dry season, aggravated by the severe drought, significantly reduces the contributions of the tributaries of the Pinheiros River, maintaining a very low flow in the main channel of the river and favoring the proliferation of algae due to the high concentrations of nutrients.
Carlos FABAL / AFP