From the Heartland Institute: the U.S. Forest Service recently admitted that its estimate of 920 million visitors to U.S. national parks in 2000 was "overstated" by at least 711 million. The USFS blames a math error.

Isn't it funny how the math errors never seem to work against government agencies? The reason why can be found in this excerpt from the Heartland press release: "When the number of visitors is large, the Forest Service and environmental activist groups cite this as evidence the federal government should take more land from the private domain to add to national forests. The argument goes that high visitor numbers indicate a public approval and public demand for far-reaching preservation programs. High visitor numbers are also offered as a justification for large increases in the Forest Service's annual budget."