Authored by: 

• John Katzenberger
• Susan Joy Hassol

It long has been recognized that habitat destruction and land use change due to human activity pose a serious threat to biodiversity. But what other threats are there and at what scale do they operate? This Elements of Change report explores the scale, mechanisms, as well as the ecological and economic impacts of biological invasion resulting from intentional and unintentional distribution of species accelerated by human activity. Control mechanisms and the consequences of inaction are discussed.