'The message of this project is that plastic's not the enemy,' de Rothschild says, speaking rapidly and unstoppably in a mid-Atlantic accent. He is full of bright energy, good humour, marketing slogans and an almost childlike enthusiasm. 'It's about rethinking waste as a resource. It's about doing smart things with plastic and showcasing solutions. It's about using adventure to engage people and start a conversation that creates change in society. You're always going to get people who say, "Oh, he's a bloody Rothschild, sitting on a boat made of, what's that? Champagne bottles?" And that's fine because it gets people talking about it and thinking about where their rubbish goes.'
The idea took hold of him in July 2006. He had just got back from the North Pole, where he led an expedition designed to heighten awareness about global warming. On the internet he came across a UN report describing the Great Pacific Garbage Patch and estimating that there was now an average of 46,000 pieces of plastic per square kilometre of the world's oceans. 'I thought, this is nuts that we don't know about this! Six-to-one plastic-to-plankton ratio? This has got to be my next expedition.'
Born in London, de Rothschild, 31, was a reckless, hyperactive child and teenager who found an outlet for energies in competitive showjumping and triathlons. His school career was erratic but he manage to buckle himself down, pass his A-levels and get into Oxford Brookes University to study computing. Afterwards he got a job with a music licensing and merchandising company, designing websites for Britney Spears and U2, and absorbing lasting lessons on the power and strategies of marketing.
Then, with the encouragement of a girlfriend, he got deeply involved in alternative medicine, which led him to organic farming in New Zealand and the subsequent realisation that it was all for naught if the air, the water and the natural environment continued to be poisoned.
In 2004 a friend's brother invited him on a 1,150-mile traverse of Antarctica by foot and ski, and on a whim he invited schoolteachers and children in New Zealand to follow the expedition's progress and learn about Antarctica.