Tessa Clarke
Olio
Clarke, 42, is attempting to cut down on the amount of perfectly good food that is thrown away every day. Her app connects people who happen to have more food than they need — say, a bunch of onions, from which they need only one — with those who may need onions. The food is then exchanged free. The London start-up has more than 500,000 users in 32 countries.
