Q: What's better for the planet — fake Christmas trees or the real thing?

A: There's no easy answer.

Fast fashion -- or very cheap, very disposable clothing -- is a great for trendy, budget-conscious consumers. Too bad it's such taking a terrible toll on the planet.

Eco-friendly designers are giving junk a second life as jewelry.

By junk, I mean forgotten, cast-off, unwanted stuff, like old footballs, Tupperware and beer cans.

In yoga, the concept of ahimsa instructs us to “do no harm”—not to ourselves, not to others, and not to the planet. Last Wednesday, Lime.com reviewed several yoga mats that take kindness to our environment seriously, either through nontoxic manufacturing, sustainable and biodegradable materials, or both. Today, we look at the yoga mat's popular companion—the block, in search of the same eco-friendliness.