A bit of a slow read that got better whenever it deviated from its lame hero-versus-villain plot.
One of my favorite Ballard novels, the tagged book takes place in a tropical London that is mostly underwater due to rising sea levels. I read this & Hello America, a companion novel, back to back. I liked Drowned World more but I definitely recommend both. Great prototypes of what is now called cli-fi. Since it is #MayMovieMagic I'd be remiss if I didn't also mention Ben Wheatley's perfect adaptation of another favorite Ballard, High Rise.
J.G. Ballard's The Drowned World & Hello America have different characters, & are set in different countries (England & America); but the common thematic concerns of global warming make them companion novels. The tagged book is the better of the two, but Hello America is definitely worth reading. Two forerunners of what is now termed cli-fi.