Trees need 30 to 40 years to fully grow, while planting big ones is expensive and risky, and the survival rate is low. "The time should at least be given to preserving the existing trees," says Lo Hua-juan.
因為樹需要三、五十年時間成長，種大樹經費高、風險大，存活率又低，「至少時間上就輸給保存原有地上的樹」，羅華娟說。