The prize honored his work on understanding the ozone layer.Credit...Eric Roxfelt/Associated Press Paul Jozef Crutzen was born on Dec. 3, 1933, in Amsterdam to Jozef and Anna (Gurk) Crutzen.

Atmospheric scientist Paul J Crutzen, who has in the past floated the possibility of blitzing the stratosphere with sulfur particles to cool the earth, said clouds gathering over the world economy ...