Elon Musk asked for a $6B plan to end hunger. Here it is.

On Oct. 31, multibillionaire Elon Musk tweeted, "If WFP can describe on this Twitter thread exactly how $6B will solve world hunger, I will sell Tesla stock right now and do it."

Now, the U.N. World Food Program has called his bluff.

U.N. World Food Program executive director David Beasley did respond to Musk's original...