[aeroman]

The wording of the article and the paper are a bit misleading here. It is definitely a one time even (although it plays out over 20 years)

The doubling of the rate of warming only applies for the first year or two. Based on this paper, over the period 2020-2030, the impact of ship fuel regulations is warming of about 0.12K. The long term temperature trend is around +0.19K over this 10 year period.