A triumph of our civilisation are the things that go on under the covers without us even noticing. When you pour stuff down the sink or flush it down the toilet, where does it go? Luckily, we don't need to think about it...until somebody does the wrong thing.

That's when we should hail the invisible, unsung heroes of this story. That's right, these are the people that go down into the bowels - literally - of a city's plumbing to do what must be done.

We can do our bit, it's not difficult... think before you flush.

Here, Rod interviews Davina McCormick, General Manger Customer Engagement at ICON water.

If you're in Floriade this weekend (21-22 Sep), be sure to see their display. Gritty, but highly recommended.

A guest podcast from Valerie Albrecht.

This podcast offers reflective space to consider the relationship between sustainability and spirituality. Is there one? Could practising sustainability nurture spirituality? Could practising some form of spirituality help us to live more sustainably? Could spirituality help us to give right place to all that is losing sustainability? Contributors from a cross section of professions and viewpoints share their knowledge, perspectives and wisdoms: a Heritage Officer Anthropologist Activist; a gardener; a writer and artist; a priest; a physics teacher, and some Australian Aboriginal healers I have had the privilege of learning with. Share your sustainability and spirituality reflections at www.theoceansofenergy.com Thank you contributors. Music: Tony O’Connor Uluru.

The race to net-zero is accelerating.

Governments around the world are increasingly committing to achieve net-zero emission targets. But what does that mean and can clean energy help achieve this?

Join Broderick as he discusses the move to net zero in Australia with Dr Andrew Feitz, Director Low Carbon Geoscience and Advice and Dr Marcus Haynes, Computational Geoscientist.

Thanks to Geoscience Australia for this week's guests.