Cika wannan jumla: A wani taron musamman kan ko za a goyi bayan Yarjejeniyar Lisbon a ranar 19 ga Janairu 2008, jam'iyyar ta kada kuri'a 63.5% a cikin goyon bayan Yarjejeniyar; wannan ya kasa da kashi biyu bisa uku na jam'iyyar don bukatun manufofi. A sakamakon haka, Jam'iyyar Green Party ba ta da wani kamfen na hukuma a zaben raba gardama na farko na Yarjejeniyar Lisbon, kodayake mambobi daban-daban sun shiga bangarori daban-daban. Ba a amince da kuri'ar raba gardama ba a shekarar 2008, kuma bayan tattaunawar da gwamnatin Irish ta yi da kasashe mambobin EU na karin garanti da tabbacin doka, jam'iyyar Green Party ta sake gudanar da wani taro na musamman a Dublin a ranar 18 ga watan Yulin 2009 don yanke shawarar matsayinta kan batun.
kuri'ar raba gardama ta Lisbon ta biyu. Daidai kashi biyu bisa uku na mambobin jam'iyyar da ke wurin sun kada kuri'a don yin kamfen don "Ee" a cikin kuri'ar raba gardama. Wannan shi ne karo na farko a tarihin jam'iyyar da ta yi yakin neman zabe a kan yarjejeniyar Turai.