Two years after the 921 earthquake, Taiwan was visited by another major natural disaster, Typhoon Toraji, which once again highlighted the problem of landslides and erosion. Seemingly in an instant, mountains and rivers were utterly transformed. Fortunately, some of the mountain districts hit hard by the 921 earthquake had implemented various bio-engineering measures to defend their homes, avoid disaster and provide their citizens with peace of mind.
九二一災變兩周年的前夕，桃芝颱風再度帶來近年台灣人聞之色變的嚴重土石流災情，一時之間，山河變色、鬼哭神嚎；然而，何其幸運地，之前九二一重創的部分山區，因為颱風來臨前不久所進行的「自然工法」工程為他們保住家園，避過浩劫，也尋回他們對捍衛家園能力的自信。