Science. 1968 Jun 28;160(3835):1444-6. doi: 10.1126/science.160.3835.1444.
Before man's intensive use of the land the rates of erosion near Rome, Italy, were approximately 2 to 3 centimeters per thousand years. With intensive occupation by man the rates have increased by an order of magnitude.
在人类大规模利用土地之前，意大利罗马附近的侵蚀速率约为每千年 2 到 3 厘米。随着人类的密集居住，侵蚀速率增加了一个数量级。
