The Acid Reign '95? Conference in Goteborg, Sweden, 26-30 June 1995, was the fifth such conference in the series starting in Columbus, Ohio, in 1975 and including Sandefjord, Norway, in 1980, Muskoka, Canada in 1985, and Glasgow, Scotland, in 1990. Approximately 420 of the presentations at the conference appear in this volume. The papers are divided into 20 different topics, each topic representing an important aspect of the acidification phenomenon. The papers appear in four books, this volume contains the plenary talks and the other three the remaining scientific papers.