The pharmaceutical industry is one of the most important industries in the world, offering new medicines, vaccines, and cures to a global population.  It is a massive industry, worthy of a deep and thorough examination of its processes and chemistry, with a view toward sustainability.  The authors describe what is and isn't truly sustainable, offering a new approach and a new definition of the sustainability of pharmaceutical and chemical engineering and the science behind it.  This is a cutting-edge work, aimed at engineers, scientists, researchers, chemists, and students.