Emissions data was also encouraging, with ammonia emissions below 10ppm and N2O below 3ppm. NOx emissions for ammonia operation were well below those generated during diesel use.
The most detailed map yet of the landscape beneath Antarctica’s ice sheet has been assembled by a team of international scientists led from the British Antarctic Survey (BAS).
The navigation channel linking Portland Harbor and the Gulf of Maine is dredged every 15 years or so — most recently in 2014, by the U.S. Army Corps of Engineers.
