M. P. Shiel. The Purple Cloud (1901). Poisonous gas.
Arthur Conan Doyle. The Poison Belt (1913) The Earth passes
through a poisonous ether.
J. J. Connington. Nordenholt's Millions (1923) Agricultural disaster
S. Fowler Wright. Deluge (1928). Flood.
Philip Wylie. When Worlds Collide (1932). Dying sun on collision course with Earth. (Film: When Worlds Collide, 1951). Also a rock band...
John Wyndham. The Day of the Triffids (1951) Venomous Plants.
Isaac Asimov. Caves of Steel (1954) Overpopulation.
William F. Nolan and George Clayton Johnson. Logan's Run (1967). Overpopulation; destruction of those over 30.
Lee Tang. The Wind Obeys Lama Torus. (1967). From India. Overpopulation.
John Brunner. Stand on Zanzibar. (1968). Young adult novel on overpopulation.
James Blish. A Torrent of Faces (1968) World ravaged by over population.
Fred and Geoffrey Hoyle. The Inferno (1973). Cosmic radiation
David Brin. Earth. (1990). Black hole.
Margaret Atwood. Oryx and Crake. (2003) Genetically engineered virus.
Cormac McCarty. The Road. (2006) Unexplained devastating cataclysm.
John Christopher. The Death of Grass (1957). Ecological disaster due to a mutated virus killing cereal crops.
Robert Silverberg. Masters of Life and Death (1957). Overpopulation.
J. G. Ballard. Billennium (1962) population
J. G. Ballard. The Drowned World. (1962). Flood.
Kurt Vonnegut, Jr. Cat's Cradle (1963) Ice-9
J. G. Ballard, The Drought (aka The Burning World) 1965.
Harry Harrison. Make Room! Make Room! (1966). (Film: Soylent Green, 1973). Overcrowding, dystopia -set in 1999.