Preface.  Some black humor for those following energy descent.

Alice Friedemann   www.energyskeptic.com  author of “When Trucks Stop Running: Energy and the Future of Transportation”, 2015, Springer and “Crunch! Whole Grain Artisan Chips and Crackers”. Podcasts:  KunstlerCast 253, KunstlerCast278, Peak Prosperity]

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CNN Wire. November 20, 2018. Fish scraps could power some cruise ships by 2021.  

“As the appetite for ocean travel rapidly grows, there’s been growing concern about its environmental impact.

Fish scraps might be part of the solution, according to a Norwegian cruise operator.

Hurtigruten, known for its trips through Norway’s fjords and to the Arctic, will power a fleet of ships partly through liquified biogas — which is produced as dead fish and other organic waste decompose, the company said in a press release.

A 2017 report by German environmental association Nature And Biodiversity Conservation Union (NABU) found that a midsize cruise ship can use well over 100 tons of fuel a day, producing as much particulate as a million cars.”