Bill Gates says world leaders must step up the fight against a worsening child nutrition crisis that’s causing trillions of dollars in economic losses — and that gut bacteria investment and more productive cows can help. The billionaire philanthropist — who has said malnutrition tops his list of problems to solve — warned that more needs to be spent on health issues, especially with an ever-more damaging impact from climate change. He speaks with Bloomberg's Caroline Hyde. 

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