Compostable and biodegradable cups and plates make no sense if you don't compost them

This is because landfills do not function like compost piles. They're packed down so tightly that food and other biodegradables don't get the oxygen, light or microorganisms that they need in order to decompose properly. In fact, many landfills are essentially big, sealed storage bins, which means that decomposition of biodegradables is nearly impossible.

In order for biodegradable waste to decompose, it has to be in a compost pile that is regularly turned. This way, a steady flow of oxygen gets to the decomposing matter.

So next time you're ready to toss your corn-based "plastic" cup into the trash can... you might hold onto it for another block or two and put it in a green compost bin instead.