Po River choked by algae as heat tests the productive plain

Italy is intensifying efforts to remove dense algae from the Po in Turin after sustained heat has accelerated growth along the country's longest river, according to Euronews and The Local Italy. Rowers on the river are battling vast blooms of algae created by ideal conditions: high temperatures in northwest Italy combined with runoff from farms that feed nutrients into the water. The algae carpets have thickened to the point where navigation has become difficult, raising concerns about the river's navigability and water quality during a period of extreme heat.

The phenomenon reflects a broader pattern. As The Local Italy reported, the Po—vital to the irrigation and transport networks of the Po Valley—is "changing" under climate stress. The combination of sustained high temperatures, agricultural runoff and reduced water flow during summer creates conditions for explosive algal growth. This is not an isolated event but part of cascading climate impacts that have already tested the region through drought, flooding and now thermal stress on critical water systems.