Tristram Stuart shares how his first foray into freeganism as a 15-year-old acted as a catalyst to his entire career. Dedicated to exposing the injustice of food waste in Western countries, Tristram shows how changing the systems that result in food waste could be one of the simplest ways to reduce pressure on the environment. Watch his TED Talk or read more in his book Waste: Uncovering the Global Food Scandal.

Image via Le Nouvel Observateur.