Serving the state of São Paulo, the Tietê river in the Atlantic Biome is a powerhouse, yet it’s one of the most polluted rivers in Brazil. WeForest and AES Brasil are collaborating to restore the forest on the edges of the Tietê river and its tributaries with native species, protecting water bodies from soil siltation and runoff from herbicides and pesticides. The project is also providing a testing ground for pioneering restoration approaches that aim to reduce the use of herbicides – which are usually relied on in Brazil to control invasive grasses – or even eliminate them entirely.