We speak to Sarah Harmer, musician and environmental activist, about the power of arts in activism, and how patience can sometimes be as valuable as urgency in addressing climate emergency.

Sarah Harmer is one of Canada's most acclaimed singer-songwriters, with a catalogue of work tethered to the nuances of the natural world.

But what do you do when your own environment is threatened? In 2005, Sarah began campaigning to protect Mount Nemo, in southwest Ontario, from commercial exploitation - including playing a hiking tour along the Niagara Escarpment, which was later released as the Juno-award-winning film Escarpment Blues.

This podcast is part of '400 Parts Per Million', an ecological arts project by Theatre in the Rough, supported by Arts Council England and the PH Holt Foundation.

Find out more at http://400.earth