Contrasting perceptions of the demographic future: from 'population explosion' to 'gray dawn' / Wolfgang Lutz and Warren C. Sanderson -- The continuing demographic transition / Wolfgang Lutz and Warren C. Sanderson -- Antecedents / Wolfgang Lutz and Warren C. Sanderson -- Structure of the volume / Wolfgang Lutz and Warren C. Sanderson -- Why do we need new forecasts? / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov -- Our approach to population forecasting / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov -- Summary of arguments and specific assumptions / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov -- The future population of the world and its uncertainty / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov -- The population of world regions and their uncertainties / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov -- Regional population shares / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov -- Comparison with other world population forecasts / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov -- Postscript: the latest UN long range projections / Wolfgang Lutz, Warren C. Sanderson, and Sergi Scherbov