Owing to improper human management, soil all over the world is becoming subject to two extremes, either increasing acidity where rainfall, population and industry are on the rise, or increasing alkalinity where rainfall, forests and population are decreasing, where plants cannot grow and where desertification is setting in.
由於人為經營不當，全世界土壤正走向兩個極端，一是雨量愈多、人愈多、工廠愈多的地方，雨也愈來愈「酸」；而雨量愈少、森林愈少、植物無法生長，無法住人之處，就愈「鹼」，也就出現「沙漠化」的問題。