evidence: SIEM PANG, Cambodia — "I remember seeing a buffalo, its head tied to a floating barrel, drifting down the river," says Pheng Sisuwath, gesturing to the Sekong River from his stilt house in Cambodia’s northeastern province of Stung Treng. [...] Now, in this village less than 40 kilometers (25 miles) downriver from the Laos-Cambodia border, news of a new "killer dam" nearing completion just outside Cambodia is prompting fresh fears of disaster. [...] Further downstream, in Stung Treng province’s Siem Pang district, the residents of Rokay village share similar fears, even if fish have long since ceased to be a source of livelihood for the community in the wake of the region’s dam-building frenzy.