Sweden has made mandatory by law and national curriculum the teaching and learning of sustainable development at various levels within the education system.

UNESCO: EDUCATION

Ministers also want best-before and use-by guidelines - mandatory under European law where health and safety is concerned - to be more easily understood.

BBC: Food sell-by dates may be ditched

It is hard to know just how expensive a mandatory GMO-labeling law could prove for California households.

FORBES: Who Will Cover the Costs of California's Prop. 37?