Plans to build about 3,000 hydropower plants in the Balkans in the next few years endanger Europe's last wild rivers and some of the most important biodiversity hot spots on the continent, campaigners say.
Stretching from Slovenia to Albania, critics say the hydropower boom threatens animal life, including endemic species of fish, and people's access to water used for drinking, fishing and farming.
"There is a tsunami of hydropower dam constructions happening here and nobody really knows about it," said Britton Caillouette, director of "Blue Heart," a documentary that focuses on efforts to halt the hydropower plans.