A podcast about extracting underground gas using fracking now that the government has issued licences to drill in the UK. We peek at the USA's experience where 95% of oil and gas wells are already hydraulically fractured.

The grain of shale rock is so fine it’s not very permeable. To release the gas within, it needs to be cracked open to make it permeable. That’s achieved by pumping millions of litres of water underground. You’ll hear from Matt Bruff of Altela Incorporated who have the technology to purify the water that comes back out of the oil well.