Former US vice president Al Gore will be among the global leaders in Dublin next month to examine the links between climate change, hunger and poor nutrition.
Presidents Michael D Higgins, Mary Robinson and Joyce Banda from Malawi will also take part in a conference that aims to put people at the heart of global development.
Organisers said up to 100 people representing farmers' organisations and vulnerable communities from as far as Africa, Asia and the Arctic will reveal the impact unpredictable weather patterns are having on their lives and to outline the solutions which they are pioneering.
The international conference, entitled Hunger - Nutrition - Climate Justice, will be held in Dublin Castle on April 15 and 16 as part of Ireland's presidency of the European Union.
An estimated 870 million people in the world do not have enough to eat.
It is believed climate change will add another 10% to 20% to the total number of hungry people by 2050, as well as some 24 million more malnourished children. Half of those are projected to be in sub-Saharan Africa.
Mr Gore, vice president for eight years from 1993, will join other leaders, policy-makers and scientists who will listen to those facing the reality of rising food prices, failed crops and under-nutrition, as well as contributing to the conference.
It will be hosted by the Irish Government and the Mary Robinson Foundation - Climate Justice and organised in partnership with the World Food Programme and the CGIAR Research Program on Climate Change, Agriculture and Food Security.