A collection of papers given at the Third Congress of German Archaeologists under the title 'Archaeology - Sciences - Environment'. 11 contributions deal with the crises management of Roman Emperors, climatic changes around 200 AD, integration of ecological and archaeological data obtained at the Roman vicus of Tienen (Belgium), dendrochronology of Roman fortlett and vicus of Rainau-Buch, technology behind Roman glass objects, archaeozoological investigations...