A company called Notpla is working on a seaweed coating to put over a cardboard container. The result is something that can biodegrade quicky and easily.
They're partnering with some European business, and with some big stadium operators to replace the packaging that's used when serving food at games and events.
They also toyed wit han idea for seaweed-based cuops to replace single use plastic cups, but post-pandemic, opted to focus on these takeaway containers.