Inside Europe: French supermarkets fight food waste

France became a leader in the fight against food waste when, three and a half years ago, it passed a law forcing supermarkets to donate to the needy rather than destroy — by dousing it with bleach for example — their unsold, near-sell-by-date food. Now a string of start-ups has emerged to cater for a thriving anti-food waste economy. This report from John Laurenson starts below a Paris church.