Just months after Elon Musk had a public spat on Twitter about what the true cost of “solving world hunger would be”, the head of the U.N.’s World Food Program is urging billionaires to “step up” and confront the global threat of food insecurity. The WFP boss had previously said “All we need is $6.6B—just .36% of the top 400 US billionaires’ net worth increase last year” in order to control a humanitarian crisis where in 42 million people in 43 countries face famine. Musk had previously offered $6 billion if the World Food Programme could provide him “open sourced...