图谱

digraph G {

   // 定义节点
   "气候变化" [shape=ellipse, style=filled, color=lightblue];
   "空气污染" [shape=ellipse, style=filled, color=lightgreen];
   "可再生能源" [shape=ellipse, style=filled, color=lightyellow];
   "能源效率" [shape=ellipse, style=filled, color=lightpink];

   // 定义边
   "气候变化" -> "空气污染" [label="导致"];
   "气候变化" -> "可再生能源" [label="减缓"];
   "可再生能源" -> "能源效率" [label="提升"];

}