Welcome to the North America regional assessment. This assessment provides an objective evaluation and analysis designed to support environmental decision-making. Existing knowledge has been assessed to provide scientifically credible answers to policy-relevant questions including:* What is happening to the environment in North America and why?* What are the consequences for the environment and the human population of North America?* What is being done and how effective is it?* What are the prospects for the environment in the future?* What actions could be taken to achieve a more sustainable future?