A lake in Southern Sweden, the Darﬂ Peninsula on the south shore of the Baltic Coast, the Island of Utila off the Honduran Coast, the Thames River in London, the River Spree in Berlin and the Ruhr River in Bochum - what do all of these places have in common? The descriptions evidently suggest some reference to water. These are the various places where the authors of this book spent ringing in the New Millennium. While few of us have memories of our specific New Year's resolutions for 2000, the majority remembers a general interest in sustainability issues and each of us can recall the specific body of water where we were. At the turn of the millennium some people warned of radical change; social, environmental and religious groups anticipated major transformations (and also the Y2K bug). Some had high hopes; others had no specific outlook. Where were you at the turn of the millennium? Do you remember personal New Year's resolutions? What happened to them? And why should it take a new year or even a new millennium to make resolutions? In 2000 governments worldwide agreed on Millennium Development Goals (MDG) to eradicate extreme poverty by 2015. In view of the deprivation experienced by billions of people, the goals appear to be a paradigmatic commitment to change. It is noteworthy that the MDG are based on a 25-year period with 1990 as their base year.