A file image shows a palm oil tree at a palm oil plantation on March 24, 2019 in Carey Island outside Kuala Lumpur, Malaysia. (Photo by Mohd Samsul Mohd Said/Getty Images) Olivia, who earned a badge for selling more than 600 boxes of cookies, had spotted palm oil as an ingredient on the back of one of her packages, but was relieved to see a green tree logo next to the words "certified sustainable." She assumed that meant her Thin Mints and Tagalongs weren’t harming rainforests, orangutans or those harvesting the orange-red palm fruit.But later, the whip-smart 11-year-old saw the word "mixed" on the label and quickly learned it meant exactly what she feared: Sustainable palm oil had been blended with oil from unsustainable sources.