A documentation of global patterns of land-use change from 1700 to 2000 is presented in Klein Goldewijk (2001). Klein Goldewijk reports on worldwide changes of land to crops of 136, 412 and 658 Mha in the periods 1700{1799, 1800{1899 and 1900{1990, respectively. Conversion to pasture was 418, 1013 and 1496 Mha in these three time periods. Figure 1 illustrates these changes, including an acceleration of tropical deforestation during the 20th century. O’Brien (2000) also documents land-use change for recent years