Through several case studies presented by commercial pig farmers, this well-documented record demonstrates the theory and practice of managing the pig environment and confronts the expensive consequences of getting it wrong. Solutions are provided, such as the systematic monitoring of the pig environment, which can expose shortcomings and suggest cost-effective ways to improve poor environmental conditions. Better ventilation, air quality, and temperature control are important factors discussed in this well-researched account that will benefit pig-production professionals and students alike.