In the 1980's Uganda was one of the largest coffee exporters in the world, far ahead of Vietnam which hardly exported any. Now the tables have turned raising interesting comparative questions.
Azteca ants are self-appointed protectors of coffee plants on Mexican plantations. But they have a lot to contend with from other insects.
High demand for coffee has pushed growers toward sun or 'reduced-shade' plantations that require more water and pesticides while reducing biodiversity.
Unless climate change can be mitigated, or farmers can find ways to adapt, the future for coffee production looks bleak.