直升飞机沿着黄河在陕西和内蒙古交界的上空飞行，放眼望去，黄沙漫无边际，百里荒无人烟，给人一种苍凉悲壮的感觉。可到了榆林沙区上空，人们眼前却突然一亮，一大片约数百平方公里的绿色灌木林海映入眼帘，顿时使人心旷神恰，对绿色树木的重要性有了更加深刻的认识。榆林人 Helicopter flight along the Yellow River in Shaanxi and Inner Mongolia at the top of the flight, looking ahead, boundless yellow sand, Barry uninhabited, giving a feeling of desolation and tragedy. Can be reached over the Yulin sand area, people suddenly shines in front of a large area of ​​about 100 square kilometers of green shrubs into the sea, suddenly make people feel good, the importance of green trees have a more profound understanding. Yulin people