No. Petroleum-based plastics should not be classed as Bioplastic. If a petroleum-based plastic molecule is modified to biodegrade then this adds environmental problems. The material breaks down faster, but the separated molecules are still petroleum-based plastics and they are now much smaller. The smaller these molecules become the more harmful they become. This is because they can now be more easily ingested by animals and humans. Adding to this problem is the fact that petroleum is not renewable, there are far more important uses for this valuable resource. Recycling these types of plastics makes sense, but making them biodegradable is a bad idea.