Watch this: How does fracking work?

Still from TED-Ed video

Fracking remains controversial, but if you're not sure why – or have a friend who doesn't quite get it – this six-minute video from TED-Ed makes it clear.

The bite-sized lesson by Mia Nacamulli and animation by Sharon Colman explains how hydraulic fracturing – AKA fracking – to extract natural gas contained within the earth actually works, and why it has got people worried for the environment, our health and even our infrastructure.