Richard Jefferies 
After London [EPUB ebook] 

After London; or, Wild England (1885) by
Richard Jefferies is a dystopian novel that indeed envisions a future in which urban civilization has collapsed following an unspecified environmental disaster. The book is divided into two parts: ‘The Relapse into Barbarism, ‘ which describes the environmental and societal breakdown, and ‘Wild England, ‘ which follows the adventures of a protagonist navigating this transformed, medieval-like world. The novel paints a vivid picture of how nature reclaims the land, and society regresses to a feudal state, highlighting themes of nature, civilization, and survival.
John Richard Jefferies (6 November 1848 – 14 August 1887) was an English nature writer, noted for his depiction of English rural life in essays, books of natural history, and novels.