A Prehistory of North America covers the ever-evolving understanding of the prehistory of North America, from its initial colonization, through the development of complex societies, and up to contact with Europeans.This book is the most up-to-date treatment of the prehistory of North America. In addition, it is organized by culture area in order to serve as a companion volume toAn Introduction to Native North America. It also includes an extensive bibliography to facilitate research by both students and professionals.

"A Prehistory of North America" covers the ever-evolving understanding of the prehistory of North America, from its initial colonization, through the development of complex societies, and up to contact with Europeans. This book is the most up-to-date treatment of the prehistory of North America. In addition, it is organized by culture area in order to serve as a companion volume to ""An Introduction to Native North America."" It also includes an extensive bibliography to facilitate research by both students and professionals.

Anthropogenic emissions of ammonia cause a host of environmental impacts, including loss of biodiversity, soil acidification and formation of particulate matter in the atmosphere. Under the auspices of the UNECE Convention on Long Range Transboundary Air Pollution, around 80 international experts met to review the state of scientific knowledge. This book reports their analysis. It concludes that threshold levels for ammonia effects have been underestimated and sets new values, it assesses the independent evidence to verify reported reductions in regional ammonia emissions, and it reviews the uncertainties in modelling ammonia, both in "hot spots" and at the regional scale.

Anthropogenic emissions of ammonia cause a host of environmental impacts, including loss of biodiversity, soil acidification and formation of particulate matter in the atmosphere. Under the auspices of the UNECE Convention on Long Range Transboundary Air Pollution, around 80 international experts met to review the state of scientific knowledge. This book reports their analysis. It concludes that threshold levels for ammonia effects have been underestimated and sets new values, it assesses the independent evidence to verify reported reductions in regional ammonia emissions, and it reviews the uncertainties in modelling ammonia, both in "hot spots" and at the regional scale.