As shipping adapts to tighter environmental rules, Saga Shipholding can offer a lesson on how to run a clean, safe fleet.

The Norwegian owner leads with the most ships — 11 — of the 48 enrolled in the US Coast Guard (USCG)’s E-Zero programme, having added two more in the past three months. Its 23 other vessels, which are also in a Saga Welco pool, generally do not trade in the US, so they are not eligible for the programme.