How a little known EU rule could push the price of a cup of coffee higher and hurt already impoverished farmers

It's a hot morning in the Lampung province on the southern edge of Sumatra and coffee grower Wiyono is leading two field agents to his farm, one holding a 2-metre black pole with a GPS unit on the end, the other with a tablet. The team is there to map out Wiyono's land in the lush Indonesian region. Documenting every plot is critical if farmers want to keep shipping produce to Europe as part of the continent's new sustainability requirements. The local coffee farming group mentioned that "Europe is doing this or that," said Wiyono (48). "I didn't ask for…