34, 35 & 36. Nils Leonard, David Foster & Richard Kieswick — Founders of Halo

Ad man Nils Leonard, the former creative chairman of agency Grey London, paired up with master coffee brewer David Foster and coffee entrepreneur Richard Kieswick in 2016 to found Halo, the world's first fully home compostable coffee capsule.

59 billion coffee capsules were produced globally in 2018, and 95% were made of plastic and aluminium destined for a landfill where they'll remain for 500 years. Halo, made from a 100% natural blend of sugar cane and pulp paper, is changing the game — it can be thrown in the home food bin or compost and will break down in four weeks or less. Its box, labels, and inserts are also all 100% compostable.

The company relaunched in November with £1.5 million ($1.9 million) in investment, and it hopes to push its big competitors in the industry — hint, hint, Nespresso — to follow suit.