Hundreds, if not thousands, of rows of oil palms are planted on Asian plantations, but they've destroyed the forests, which were once teeming with species who had populated the area for millions of years: orangutans, Asian elephants and scores of birds and amphibians who are not found anywhere else.
The expansion of the unsustainable palm oil plantations threatens to wipe out what remains of the area's dwindling biodiversity.
SumofUs's new campaign calls on Pepsi, who purchases 427,500 tons of palm oil every year, to stop buying unsustainable oil. Many other companies - such as Ferrero, Kellogg's, Mars, Nestle and P&G; - adopted pledges in 2014 saying they would use conflict-free, sustainable palm oil.
A petition asking PepsiCo to put a stop to deforestation has already gained more than 250,000 signatures.
PepsiCo has made some effort to source better palm oil. Last year, the company pledged that by 2015 it would buy only oil that was certified by the Roundtable for Sustainable Palm Oil, though it's unclear if that has happened yet. And, as Greenpeace pointed out, the commitment did not guarantee that the supply chain would be free of deforestation or social conflict - two things that are key for a responsible palm oil plantation. The organization called PepsiCo one of the least "forest-friendly" global consumers of palm oil.