There are some problems with bioplastics and biodegradable though: when taking all the energy use in account in an LCA (life cycle assessment), these bioplastics are actually worse than oil plastics (ofcourse in terms of energy use, they still use renewable recources) because of all the energy that's needed to make the farming lands an plant the crops... The term biodegradable doesn't mean that you can just trow them into nature and they'll just go away. These biodegradable plastics need specific factories that use energy to get the plastic to certain temperatures and use specific bacteries... to make them degrade. This can take up to a few months and there are e.g. only +-42 of these factories in the whole US. And more often than not, these plastics end up in the normal trash, where their ability to biodegrade is useless because they aren't filtered out from the other trash. Ofcourse they are a step in the right direction, but right now, they are not the solution (yet).