Minister for Communications, Energy and Natural Resources Eamon Ryan highlighted the importance of the treaty in relation to energy security and climate change. "We are utterly dependent on our fellow EU member states for energy security," he told The Irish Times. "Ninety per cent of our gas comes from other EU countries."
Stressing the need to ensure a supply of gas, oil and electricity for Ireland's basic needs, he said: "We have no ability to provide such security for our people in the absence of co-operation from Europe."
His experience at EU level showed that "it is the only progressive forum in which the issues of energy security and climate change are being tackled".
"I have a real dread that failing to get this treaty through would cripple this whole climate change and energy security initiative."
Stressing that it was a personal view, he said: "As we face into a peak in global oil production, we can only provide ourselves with energy security through the European process."
Minister for the Environment John Gormley said the Greens had criticised the EU in the past for being a top-down organisation, but this was being addressed in the treaty. "A key reason for my decision to support the Lisbon Treaty is that it takes important steps towards remedying this. These include more direct lawmaking powers for the European Parliament and more supervisory powers for the Dáil and other national parliaments," he said.