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Top 3 challenges and purposes of education (design)

Quais acha que serão os maiores desafios para o mundo em 2050? 
Por favor, classifique os três principais desafios. Order the items from the following list. First select an item with the spacebar to show a menu of possible ranking positions. Next, click a ranking position to order it in the ranked list. Note the menu will display more ordering options as you add items to the ranked list.