Date oases in the southern city of Tozeur used to have three layers of agriculture: vegetable crops close to the soil, citrus trees in the understory, and date palms towering over the rest. With the advent of monoculture for Diglet Nour dates, the palm groves are now choked with rubbish.

Rubbish conundrum: Tunisia cannot handle its own waste, so why is it importing Europe's?