The Environmental Data Initiative Repository concentrates on studies of ecological processes that play out at time scales spanning decades to centuries including those of the NSF Long Term Ecological Research (LTER) program, the NSF Macrosystems Biology Program, the NSF Long Term Research in Environmental Biology (LTREB) program, the Organization of Biological Field Stations, and others. The repository hosts data that provide a context to evaluate the nature and pace of ecological change, to interpret its effects, and to forecast the range of future biological responses to change.