Leading the charge to make schools greener is the Green-Schools international environmental education programme and award scheme, run by An Taisce. In Ireland, Green-Schools is operated in partnership with Local Authorities and has been a fully national programme since 2001. Internationally it is known as 'Eco-schools'.

The award part of the scheme comes in the form of a green flag - a now well-respected and recognised eco-label. Usually, if a school reaches this target, it displays the flag outside the school or in the foyer. To keep the school striving to reduce its environmental impact the green flag award requires renewal every two years.

Scoil Mhuire Senior was first awarded the Green Flag well over a decade ago.