εξαγωγή και τιμή σίτου. μείωση των εξαγωγών σίτου και σιτηρών. παγκόσμια επισιτιστική κρίση. πείνα και έλλειψη τροφής. απαγόρευση εξαγωγής σιτηρών και γεωργικών προϊόντων.

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κρίση πετρελαίου. έννοια της παραγωγής πετρελαίου εισαγωγής και εξαγωγής

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