Op-Ed: Understanding the Full Lifecycle Emissions of Alternative Fuels

All alternative marine fuels share a common decarbonization pathway beginning with fossil or fossil-derived fuels, also known as "gray” fuels, and ending with renewable synthetic e-fuels, also known as “green” fuels. For some fuels, this pathway also includes a biogenic fuel mid-point.

While fuels share a common pathway, they are all at differing points on that path in terms of technological and operational readiness, safety or commercial availability. Given this, it is essential to compare the emissions...