Updated 13.00
The Taoiseach Enda Kenny is among almost 150 world leaders gathering in Paris for talks on climate change.
The United Nations wants them to agree to big cuts in emissions to limit the rise in global temperature.
UN General Secretary Ban Ki Moon appealed to leaders to find agreement:
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To Live in Dignity - climate message from Ban Ki-moon
"Investing in climate change is a way to put an end to global poverty, to live our human lives in dignity"Video message from UN Secretary-General Ban Ki-moon in Paris for COP21.
Posted by United Nations on Sunday, November 29, 2015
Asad Rehman is an international climate campaigner for Friends of the Earth.
He has high hopes a deal will be reached:
"What we really need to see is concrete measures, particularly on reducing emissions today, not tomorrow. Rich countries, the developed countries who are most responsible, really taking the lead, and really helping some of the poorer countries."
Yesterday campaigners staged demonstrations in cities across the world and there were clashes with police in Paris when 200 people who defied a ban on mass demonstrations put in place because of recent terror attacks were arrested.
BFM TV has footage of a protest carried out in the French capital yesterday:
Sky's Enda Brady is in the French capital, and says after the terror attacks there, security is incredibly tight:
"They are bringing in 120,000 personnel from the army and from the police. Every single hour of this conference there will be 15,600 police on duty. They are taking no chances whatsoever."
Meanwhile, President Barack Obama used the opportunity to visit the site of the terrorist massacre at the Bataclan theatre to pay tribute to the victims.
He and his French counterpart Francois Hollande laid white roses outside the Bataclan theatre late last night.
