A startup founded by 2 college friends is turning mushrooms into walls to help rid the world of an insidious ingredient

Not only does it take centuries to break down in soil, some of it never gets there in the first place, instead ending up in lakes, streams, and the ocean, where it fills the stomachs of fish and birds.

So two friends, Eben Bayer and Gavin McIntyre, came up with an alternative. Their new company, Ecovative, makes building insulation and packaging materials that break down completely in the environment.

Their secret ingredients? Mushroom roots and farm waste.

It might sound out-there, but the startup is catching the attention of several big companies, including computer giant Dell, who is already using its products, and Swedish furniture maker Ikea, who is considering doing the same.

Here's a look inside the place where all of it gets made: