Expedition Finds Traces of Cocaine, Caffeine and Pesticides at the Source of the Tiet�, S�o Paulo's Largest River

Why this matters: an international story with cross-border implications worth tracking.

An expedition by NGO SOS Mata Atl�ntica along the Tiet� River found traces of pesticides, cocaine and caffeine near the river's source, in Sales�polis, as well as microplastics at several points along the waterway. Over more than 1,100 km, pollution intensifies until reaching the environmental colla