The Italian government intends the charter to be the legacy of the six-month Milan Expo 2015 world's fair and will present it to the UN secretary general in October just before the world's fair closes. Mattarella said the charter has "great ethical and political value" by indicating crucial goals and asking for "tough changes" in behavior and regulation.
The agriculture ministers of Angola, Argentina and Iran, who attended a two-day meeting on the charter's themes, were among those who signed the document.
It has been criticized for not addressing the causes of hunger or such debated technologies as genetically modified crops.
Ertharin Cousin, executive director of the World Food Program who addressed the agriculture ministers, said the charter seeks the same goal of combatting world hunger as the UN sustainable development goals that will be decided later this year.
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