Tens of millions of lives depend on the Mekong river for fishing and farming as it travels through China and South East Asia. But there are increasing signs that this river with one of the richest ecosystems on earth is being strangled. A cascade of dams, intensifying climate change, and sand dredging have scientists worried. Is this region harnessing the river’s power – or are they killing it? Laura Bicker visits communities whose livelihoods rely on the Mekong and meets a new generation trying to breathe life into the dying river.