Barret Ersek may have the best “lemons into lemonade” story ever. When his fertilizer factory literally blew up, Ersek was left with next to nothing. Instead of going bankrupt, though, he rebuilt his business with purpose, turning it into the green, sustainable company he’d always wanted. Now the CEO of Holganix, Ersek explains how the importance of an overwhelming “why” helped him grow his reinvented company into the largest provider of organic phosphorous-free fertilizer in the U.S.