What Is Natural? The Need for a Long-Term Perspective in Biodiversity Conservation. K. J. Willis, et al. Science 314, 1261 (2006); DOI: 10.1126/science.1122667 By Ana Prohaska Conservation science and management tends to ignore long-term historical records.  An increasing number of studies, however, have illustrated the importance of long term and palaeo-ecological data in several aspects…