Bala Sivaraman drives an electric car around the US capital Washington, buys used clothes and furniture and cooks his vegan meals on an induction stove he bought after parting ways with his gas oven.The clothes he's wearing during a video interview are four years old and his iPad is a five-year-old model that he recently had repaired after cracking its screen, instead of buying a new one -- measures that embody his philosophy of buying less, and buying to last.