orangutans and how palm oil plantations have pushed the primates to the brink of exting by destroying their habitat. you can find palm oil in 10% of the products on your supermarket shelf. >> i remember, my mom brought anything home with palm oil, i'll like, mom, you're contributing to deforestation, how could you do this? >> reporter: so, you can imagine how crummy they felt when they discovered the 200 million boxes of cookies the organization sells each year were part of the problem. >> i think when we both found out that palm oil was in the cookies, we were shocked. i was sad. i burst into tears. >> reporter: what started out as a project about palm oil and primates ended up turning up the heat on the cookies, all of which contain palm oil. the girls not only stopped selling them, they went all the way up the food chain at girl scouts usa to try to convince the organization to switch to a more environmentally friendly alternative, like canola oil. >> it's funny. part of the girl scout law is to make the world a better place. and they're not giving us the opportunity, i guess, to