On tiny plots, and often poor-quality soil, without modern equipment or farming methods, and sometimes beset by land disputes, many peasant farmers struggle to feed their family and grow just a little extra to sell in the village market.

ECONOMIST: The problems of plugging a square economy into a round world

However, arsenic is also used in industry (as a wood preservative, and also in paints, dyes, metals, drugs and soaps) and in agriculture and is sometimes released into the environment from factories, industrial plants and farming enterprises.

FORBES: "Plastic Bottle" Filters Can Help Millions Poisoned by Arsenic-Contaminated Water