The latest episode of the CBC show Spark features a long interview with Alex on product-service systems, producer responsibility, backstory insight and why owning things may be over-rated.

Here's the run down for the show:

On this episode of Spark:

* Luke Closs measures his energy use with his Kill-a-watt
* The Ottawa Public Library lends Kill-a-watt meters
* Michael Bhardwaj fights vampire power
* Alex Steffen blogs bright green at Worldchanging (full interview)
* Nora mentions the Spark Wiki
* Bruce MacDougall poses an energy riddle
* Tom Howell investigates obsolete armoires
* Bill St. Arnaud explains how the Internet causes carbon emissions (full interview)

You can download to the MP3 here or listen to the complete raw audio of the interview here.