Ireland's climate policies, whether adequate or inadequate, can have very little affect on the evolution of the AMOC, or any other large-scale climactic phenomenon. There are vastly more influential factors at play all around the world.
Inasmuch as it’s a country of five million people you are right in absolute terms, but considering the government’s shocked Pikachu face reaction to being held to the terms of an agreement Ireland signed up to it’s still a bit galling.
One of the best things Ireland could do is build lots of housing close to job centres so people don’t have to drive so far to work, or ideally can take public transport (or bike or walk)
It’s remarkable seeing people commute to Dublin from tullamore or even athlone.
Relying less on concrete would help too, wood construction seems to be getting more common at least.