Agence France-Presse: Two young American businessmen have developed a green alternative to ubiquitous polystyrene packaging — made from farm waste and mushrooms — that uses 10 times less energy to produce, and biodegrades into a natural fertilizer. Called EcoCradle, the product can also be used as insulation and is grown, not manufactured, with no greenhouse gas emissions, such as CO2, as a byproduct, co-inventor Eben Bayer, 24, told AFP in an interview. "We have developed a platform that we think …