Says Huang: "Both Laozi and Zhuangzi were naturalists," and if Laozi were alive today he would undoubtedly be a strong proponent of ecological preservation. He would call for protection of the ozone layer, because he was opposed to excessive consumption and the loss of simplicity. The next great Daoist Philosopher to come along after Laozi was Zhuangzi, naturalist extraordinaire.
「老子與莊子都是自然觀察家」，黃瑞祥說，老子如果活在今天，當然會強烈提倡生態保育，呼籲保護臭氧層，因為他反對世人過度消費、失去純樸自我，至於老子的後生﹘﹘漆園吏莊子，則是自然觀察家，他會邀人去參加自然之旅了。