Terrifying article about how the largest container ships in the world emit more pollution than all of the world's cars. 1 ship can equal the pollution and harmful chemical output of 50 million cars. Other sources: treehugger.com.

Britain and other European governments have been accused of underestimating the health risks from shipping pollution following research which shows that one giant container ship can emit almost the same amount of cancer and asthma-causing chemicals as 50m cars.

Confidential data from maritime industry insiders based on engine size and the quality of fuel typically used by ships and cars shows that just 15 of the world's biggest ships may now emit as much pollution as all the world's 760m cars. Low-grade ship bunker fuel (or fuel oil) has up to 2,000 times the sulfur content of diesel fuel used in US and European automobiles.