SHIPPING IS A dirty business. Since the late 19th century, when steam replaced wind as the main means of propulsion, ships have relied on filthy fossil fuels. Coal-fired steam has given way to internal-combustion engines. But these still burn stuff that is so gunky as to be almost solid unless heated. Like coal, these refinery dregs, known as bunker fuel, release a lot of carbon dioxide--perhaps 3% of global emissions of this greenhouse gas. Cleaning up ship exhausts is therefore a good idea if ...
SHIPPING IS A dirty business. Since the late 19th century, when steam replaced wind as the main means of propulsion, ships have relied on filthy fossil fuels. Coal-fired steam has given way to internal-combustion engines. But these still burn stuff that is so gunky as to be almost solid unless heated. Like coal, these refinery dregs, known as bunker fuel, release a lot of carbon dioxide--perhaps 3% of global emissions of this greenhouse gas. Cleaning up ship exhausts is therefore a good idea if ...
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