"In all, over the past five years, the forest area on the mainland has decreased by over 20 million mu a year, as much as the total forested area on Taiwan," Professor Cheng Chu-yuan says.
「整體算來，近五年，大陸每年森林面積減少二千多萬畝，相當於台灣森林的總面積」，鄭竹園教授在香港明報月刊發表的「中華民族生存發展面臨的嚴重危機」一文中提到。