Artist Norman Thelwell is best known for his cartoons depicting plump, petulant ponies and their young riders, but The Effluent Society shows another aspect of his work and character. Thelwell was passionate about the countryside and nature. During his life he became increasingly concerned about the impact of development, pollution and society's treatment of the environment. When The Effluent Society was first published in 1971, his concerns were way ahead of their time. Today, environmental and conservation issues are in the mainstream and have become a global priority.Although the cartoons focus on a serious topic there is no mistaking Thelwell's inimitable style. He used his talent and humour to convey a powerful message: the need to protect the environment. He also takes a wry look at modern life and so-called progress.

Thelwell admitted that out of all his books, The Effluent Society was the one that gave him the greatest 'personal satisfaction' and, as such, the re-issue of this title is a fitting tribute to the artist.