medium · GMAT Verbal
Shipping lines are reconsidering ammonia as a fuel because, unlike conventional marine fuel, burning it emits no carbon dioxide. An industry analyst argues that switching the global fleet to ammonia would therefore substantially reduce shipping's contribution to global warming.
Which of the following, if true, most weakens the analyst's argument?
- Ammonia is toxic and would require new safety protocols for crews handling it.
- Most of the world's ammonia is currently manufactured using fossil fuels, releasing large quantities of carbon dioxide before the fuel ever reaches a ship.
- Conventional marine fuel is cheaper per unit of energy than ammonia.
- Some shipping lines have announced plans to test ammonia engines within the next two years.
- Ammonia engines are more difficult to ignite than engines burning conventional fuel.
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