Reporting from Sausalito, Calif. - David de Rothschild is talking trash, lots and lots of trash."There were 25 billion Styrofoam cups used last year. How do you even get your head around what 25 billion Styrofoam cups looks like?" he said. "Eighty-odd percent of what's purchased by Americans is thrown out within six months."On this day, though, the British banking heir is focused on some very particular refuse as he skims along the San Francisco Bay in a catamaran called Plastiki: The 12,000 or so recycled soda bottles lashed together to build his clunky vessel, and the growing heap of plastic fragments called the Eastern Garbage Patch floating in the Pacific.If all goes well -- so far, it's been a little hit and miss -- De Rothschild hopes to set sail aboard Plastiki in March, tour the garbage patch and end up in Australia, while blogging about the evils of plastic and a consumer society.He also wants to highlight Plastiki's innovations, like the glue made of cashew hulls and sugar, which he said "could go to market today and take epoxies -- horrible, noxious stuff -- off the shelf straightaway."En route from Sausalito to Sydney, De Rothschild will navigate two well-trod traditions -- quirky British explorer and modern eco-celebrity -- in a quest that smacks of equal parts Sir Richard Francis Burton and Ed Begley Jr. The first conquered uncharted territory; the second powered his toaster with electricity generated by pedaling a stationary bike.De Rothschild, 31, has been lauded as an eco-adventurer, envied as a "billionaire eco-warrior" and derided as a dilettante "eco-toff" -- British slang for a rich boy with a clean, green conscience.He prefers the term "environmental storyteller" and said the "idea of the celebrity eco thing makes me want to puke. . . . It belittles the severity of the issues that we've got to tackle. Unfortunately, we're in a society that loves labels and loves celebrities."This from a man whose Sundance Channel series, "Eco Trip: The Real Cost of Living," was promoted online with video of a lanky De Rothschild, wetsuit half off, voice-over describing the bearded Brit as "the hottest thing since global warming."To be fair, though, sailing a boat made of used bottles across the Pacific Ocean is a lot more challenging than driving a Prius to the Academy Awards.A onetime hyperactive child turned top-ranked horse jumper, De Rothschild stayed away from the family's storied banking business. He got a degree in naturopathic medicine and bought an 1,100-acre farm in New Zealand, where he still grows organic medicinal herbs.In 2004, he signed on to an expedition to traverse Antarctica. Facing whiteout conditions, the group spent the first two weeks in small tents waiting for the weather to turn. To pass the time, De Rothschild dared his trek-mates to do stunts."Snorting energy drinks up our noses, putting your tongue on the front of the snow machine, bare metal at minus 30 degrees," recalled expedition leader Patrick Woodhead, who likens De Rothschild to Tigger on Ecstasy. "It's a miracle we didn't injure ourselves before starting. . . . David is the most enthusiastic person I know."Before leaving for Antarctica, De Rothschild took out an ad in a New Zealand teaching publication urging students to learn about the frosty region.It showed teachers how to follow the trek, and "let kids plan their own expeditions in their classrooms," De Rothschild recalled. When he returned home he was "bombarded by messages from teachers."Six months later, he launched Adventure Ecology, an organization that blends treks and technology to teach schoolchildren about the environment.Then he set off to cross the North Pole with skis and sled dogs and chronicle the trip online. But melting ice made it impossible for the team to finish its journey."There I was in my tent wearing merino long johns, cooking my dinner and sweating away," he said, recalling an April night near the North Pole. "It doesn't take a scientist to realize that something's amiss."The trip was aborted after 100 days, he said, but the Adventure Ecology website got more than a million hits.While researching his next trek, De Rothschild came across an article by Charles Moore, a Long Beach marine researcher who had sailed through a vast, plastic-filled gyre between Hawaii and the U.S. mainland.