Mandating the use of biodegradable plastic will drastically reduce the overall waste that is found in the Ocean and on the land. Countries can and will have a safety net when there are no managed landfill operations or proper waste disposal facilities.
Technologies such as the one found in Guinea are helping reduce the overall impact of plastic waste on the environment.
If you mandate the use of biodegradable plastic within countries it allows for technology to be used to create more jobs, such as biodigestion and waste to energy jobs. This in turn creates a stable economy.
Furthermore, the use of biodegradable plastic allows for a cleaner environment.