It is true that projections indicate the global population will increase and then stabilize at 9 to 11 billion by the end of the 21st century. While some people lean toward the viewpoint that this growth will present significant challenges for humanity, I would argue that another enormous and unresolved problem will be the quality of the air.

It is true that projections indicate the global population will increase and then stabilize at 9 to 11 billion by the end of the 21st century. While some people lean toward the viewpoint that this growth will lead humanity to significant challenges, I would argue that another enormous and unresolved problem will be the quality […]