Can the world learn from indigenous food systems, before they are lost?
This attitude is true across most of the world's indigenous peoples and has been vital in preserving the natural world.
He is one of the authors of a 2021 report led by the UN's Food and Agriculture Organization (FAO) on indigenous food systems, which warned of the increasing threats these unique traditions face.
Pictured is Tomás Unkuch, from a Shuar community in Chumpias, in the Morona Santiago province of Ecuador.
"Indigenous peoples have a harmony and interconnectedness with (nature) that is based on balance and collaboration," says Roy.
For instance, fallow land (leaving soil unplanted for a period of time) has long been a tradition of indigenous peoples.
The knowledge indigenous peoples have of wild fauna and flora could also be vital to a sustainable future.
According to the FAO study, some indigenous food systems use more than 250 species for food and medicinal purposes.
Indigenous peoples find themselves at the frontline of climate change, with many living in areas that are subject to rising temperatures or extreme weather events.
PreservationTo save these cultures, Roy urges nations to guarantee indigenous peoples "rights to land" and "rights to traditional knowledge and language."
The FAO report calls for more inclusive dialogues with indigenous peoples and to involve them in sustainable management decisions.
It concludes that "the world cannot feed itself sustainably without listening to indigenous peoples."
Roy believes the biggest lesson to be learned is the indigenous peoples' value system: the worldview that "land and nature is not a commodity."