Dawn Sawvel <dasawvel@ifai.com> wants to know the following: Does anyone have a statistic on the amount of topsoil erosion in the U.S. and/or worldwide during the past year, two years, five years? If so, do you have a citation for the source of the figures? I would appreciate if you could let Dawn know. She is the editor of a magazine on erosion control and needs this info for an article. Mike Ravnitzky