“The new-style Lego elements are made from polyethylene – a soft, durable and flexible plastic that can now be made with ethanol extracted from sugar cane material and, Lego claims, is as durable as conventional plastic. As a bio-plastic, it can be recycled many times, though it is unlikely to be 100% biodegradable.” https://www.theguardian.com/lifeandstyle/2018/mar/02/first-sustainable-lego-pieces-to-go-on-sale

More plastic persistence, more brick-eating.