

It looks like the IMO’s pledge to reduce emissions by at least 20% is totally feasible. At least according to the following recent study
Reducing travel speeds and using an intelligent queuing system at busy ports can reduce greenhouse gas (GHG) emissions from oceangoing container vessels by 16-24%, according to researchers. Not only would those relatively simple interventions reduce emissions from a major, direct source of greenhouse gases, the technology to implement these measures already exists.
I am not really sure I understand what you mean. Of course 0.5°C is very important, but to my understanding, the Paris Agreement is really not going as planned.
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Edit: Since the above article dates a few months back I searched for something more updated and found the perfect link: NDC Tracker