investors seek to purchase stock, companies known for their positive environmental policy can be attractive. Potential stockholders and investors see this as a solid decision: lower environmental risks lead to more capital at cheaper rates. Companies that highlight their environmental status to consumers can boost sales as well as product reputation. Going green is often a sound investment that can pay off. Alongside the environmental benefits of adopting sustainable packaging, eco-friendly packaging can increase sales, reduce packaging cost, and increase the image of a company's brand alongside the rising awareness spread regarding environmental impact. There has also been found a direct correlation between a company's implementation of sustainable packaging and a more sustainable supply chain management. Alternatives such as bio-based plastics that are abundant, low cost, and biodegradable, offer a possibility of reducing use of petroleum resources and carbon dioxide emissions. Alternatives to conventional plastics Plastic packages or plastic components are sometimes part of a valid environmental solution. Other times, alternatives to petroleum and natural gas based plastic are desirable. Materials have been developed or used for packaging without plastics, especially for use-cases in which packaging can't be phased-out – such as with policies for national grocery store requirements – for being needed for preserving food products or other purposes. A plant proteins-based biodegradable packaging alternative to plastic was developed based on research about spider silk which is known for its high strength and similar on the molecular level. Researchers at the Agricultural Research Service are looking into using dairy-based films as an alternative to petroleum-based packaging. Instead of being made of synthetic polymers, these dairy-based films would be composed of proteins such as casein and whey, which are found in milk. The films would be biodegradable and offer better oxygen barriers than synthetic, chemical-based films. More research must be done to improve the water barrier quality of the dairy-based film, but advances in sustainable packaging are actively being pursued. Sustainable packaging policy cannot be individualized by a specific product. Effective legislation would need to include alternatives to many products, not just a select few; otherwise, the positive impacts of sustainable packing will not be as effective as they need in order to propel a significant reduction of plastic packaging. Finding alternatives can reduce greenhouse gas emissions from unsustainable packaging production and reduce dangerous chemical by-products of unsustainable packaging practices. Another alternative to commonly used petroleum plastics are bio-based plastics.