Until you, mschuster91, figure out how to get rid of food waste and fossil fuels, id rather half the world not starve.
If you need it spelled out what you need to do: limit portion sizes in restaurants (where a lot of the food waste happens, also contributing to the insane rat infestation issues [3]) by law since Americans seem to love extensive portions, educate people how to cook and how to plan cooking, ban ultra large food packaging that no reasonable family can use before the product goes bad, and introduce actual public transit on all levels from local over regional to interstate to reduce your dependency on fossil fuels.
As for food waste in developing countries, it would be a good starter idea to invest into electrical grids and microgrids, it's hard to keep food from perishing when you don't have a stable grid to run a fridge. But that's a monumental task that needs international cooperation.
[1] https://www.rts.com/resources/guides/food-waste-america/
[2] https://zerowasteeurope.eu/our-work/eu-policy/waste-manageme...
[3] https://www.npr.org/sections/thesalt/2012/11/27/165907972/fo...
You can't eliminate food waste - but many well off Americans have no clue about how to properly feed themselves while minimizing waste.