Which WWII home front sustainability initiative was known as 'Salvage for Victory' and involved Americans collecting what specific material that saved an estimated 28 million trees?

During World War II, nations implemented innovative sustainability initiatives to conserve vital resources for the war effort. These early examples of large-scale recycling and resource management campaigns helped nations maintain production while teaching civilians about conservation. Many of these wartime practices influenced modern sustainability concepts. Test your knowledge about one of history's most significant sustainability campaigns!

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Waste paper collection (including newspapers, magazines, and cardboard)
Aluminum scrap drives (primarily from kitchen utensils and foil)
Used cooking fat collection (for glycerin in explosives)
Rubber recycling (from tires and household rubber items)