Francis said the paradox of abundance described by Pope John Paul II -- whereby there is food for everyone yet not everyone can eat -- continues to be an issue "despite the multiplication of organisations and responses by the international community on nutrition."
The pope addressed a session of experts drafting the so-called Milan Charter that seeks commitments from governments, organisations and individuals during the Expo 2015 world fair to resolve such issues as ensuring food security, decreasing food waste and combating both hunger and obesity.
Francis gave his blessing to the delegates, and some guidelines, urging them to focus on resolving "the structural causes of poverty," not just address emergencies, and to maintain the dignity of the individual at the heart of economic policy.
He also urged them to show courage in protecting the planet "the mother of everything that asks respect and not violence."
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The Italian government intends the Milan charter to be the legacy of Expo 2015, increasing awareness of the universal right to a "healthy, safe and sufficient" food supply, Italian agriculture minister Maurizio Martina told the Associated Press.
The document will be presented to 145 agriculture ministers meeting in Milan in June for their contributions, and then presented in October, at the end of the Expo, to the UN secretary general.
"It should be very tight, with clear and precise commitments," Martina said.