Breakthrough bioplastic decomposes in 2 months

> A plastic alternative being developed in Denmark, made from barley starch and sugar beet waste, could soon be holding your leftovers.

> The best part about the University of Copenhagen-designed material is that it decomposes in nature in about two months, according to a lab summary. Standard plastic takes around 20 to 500 years (or more) to break down, according to the UN.

Ok, why would you want plastic to decompose in 2 months? What about shelf life? Will I need to worry about my packaging decomposing?

what's the manufacturing cost as compared to plastic?