Cellulose and algae are considered safe for human consumption and are also biodegradable; but is that an RCT study?

CO2 + Lignin is not edible but is biodegradable and could replace plastics. "CO2 and Lignin-Based Sustainable Polymers with Closed-Loop Chemical Recycling" https://onlinelibrary.wiley.com/doi/10.1002/adfm.202403035

What incentives would incentivize the market to change over to sustainable biodegradable food-safe packaging?