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The Expo 2015 world's fair opened Friday for a six-month run and its theme is "Feeding the Planet in Milan, Italy. Some 145 countries will show their commitment to creating sustainable ways of producing and delivering food across the globe while guaranteeing the safeguard of the planet.

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People walk at Expo 2015 in Milan, Italy. Italy.Alessandro Garofalo/Reuters

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Italian Prime Minister Matteo Renzi speaks during the opening ceremony of Expo 2015 in Milan, Italy.Alessandro Garofalo/Reuters

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The Italian pavilion is seen at Expo 2015 in Milan, Italy.Alessandro Garofalo/Reuters

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People walk in the Brazilian pavillion at Expo 2015 in Milan, Italy.Alessandro Garofalo/Reuters

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The Argentinian pavillion is seen at Expo 2015 in Milan, Italy.Alessandro Garofalo/Reuters

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The Italian pavillion is seen at Expo 2015 in Milan, Italy.Alessandro Garofalo/Reuters

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The "Tree of life" is seen at Expo 2015 in Milan, Italy.Alessandro Garofalo/Reuters

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Tthe Pavillion of Malaysia at Expo 2015 in Milan, Italy.OLIVIER MORIN/AFP / Getty Images

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Hostesses pose in front of the American pavillon in Milano Expo 2015.Gieseppe Cacace/AFP / Getty Images

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The Great Britain pavilion is seen at Expo 2015 in Milan, Italy.Alessandro Garofalo/Reuters

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