Wallace Broecker, a professor at Columbia University in New York, speaking during the Balzan Prize ceremony in Rome in 2008. Broecker, a climate scientist who popularized the term “global warming,” died Monday.

Wallace Broecker, a professor at Columbia University in New York, speaking during the Balzan Prize ceremony in Rome in 2008. Broecker, a climate scientist who popularized the term "global warming," died Monday.

Wallace Broecker, a professor at Columbia University in New York, speaking during the Balzan Prize ceremony in Rome in 2008. Broecker, a climate scientist who popularized the term “global warming,” died Monday.

Wallace Broecker, a professor at Columbia University in New York, speaking during the Balzan Prize ceremony in Rome in 2008. Broecker, a climate scientist who popularized the term “global warming,” died Monday.