Climate change is an issue that has taken on great urgency in recent years, but it is not an isolated problem. Hans Tammemagi argues that climate change is but one of the many problems associated with the changing character of one of the most basic components of life: the air we breathe. Tammemagi's fascinating exploration of air illustrates that it is far from being an empty void; rather, it is a vast ocean of gases that are layered, constantly...