Tremendous technological breakthrough and economic development determined unprecedented Human Population growth within last century. Population increase is one of the key reasons for comprehensive nature of anthropogenic impact on biosphere. It is simply too many of us already to continue to live as our ancestors did ("consume as much as you can as fast as you can"). We are in a new reality already, and too many decision-makers do not understand it yet. More important -- they often do not want to understand it. Are any solutions to population-related problems? Sure. But we have to be open to think, and to act in a new way.
Current World Population Clock
Human Population, Food Production, and Biodiversity Protection (Science)
Thematic Population Maps (US Census Bureau)