四、營建工程考量永續發展，先從設計者開始，設計出永續的工程，供承包商據以施工。試以道路工程為例，說明永續設計（或綠色設計），在「設計前」會遭遇何種困難？請列出三項加以說明。（25 分）

⑴ U.N. Office for the Coordination of Humanitarian Affairs chief Stephen O’Brien warned that more than 20 million people face starvation in Yemen, Somalia, South Sudan, and Nigeria, in what he says is the largest humanitarian crisis since 1945. The concurrent famines have a common, disturbing theme: they are man-made, precipitated by conflict and perpetuated by political jockeying.（15 分）