It’s surprising how much pollution ships emit: over 2,000 tons of diesel soot a year in southern California, for example, about 10 percent of the total in the region.

Worse, a new study by researchers at the University of Delaware and Rochester Institute of Technology finds that the burning of cheap, dirty, sulfurous "residual oil" on ships kills an estimated 60,000 people around the world. "Premature mortality" is the phrase used in the study.

shipping particulate matter
Annual average contribution of shipping to (particulate matter) PM<sub>2.5</sub&gt concentrations for Case 2b (in µg/m3). Copyright © 2007 American Chemical Society

(h/t: The Blue Marble)