In developed countries, coal is the most hazardous (bottom left), according to the Paul Scherrer Institute in Switzerland, which studied more than 1, 800 accidents worldwide over nearly 30 years.
根据瑞士保罗·谢勒研究所对近三十年世界范围内超过1800其事故的研究结果，煤炭行业是最危险的(见左边底部)。
A report by Switzerland's Paul Scherrer Institute estimates that DAMS are the most potentially hazardous source of energy.
瑞士PSI研究所的一份报告揭示了水坝是第一潜在风险源。
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