Conservation Magazine: These days, Jason Clay walks around with an eerie sense of déjà vu. Over the past few years, the World Wildlife Fund (WWF) anthropologist has become deeply entangled in the tortuous struggle to ensure that supposedly “green” biofuels–such as ethanol brewed from corn and biodiesel wrung from palm nuts–don’t decimate biodiversity in an attempt to save the planet. It’s been a dizzying and sometimes disorienting experience. For instance, Clay watched as biofuels, once hailed as the savior of …