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I have posted my [keynote talk](http://www.johnehrenfeld.com/Lisbon%20talk%3Ass.pdf) to the [International Society for Industrial Ecology](http://www.is4ie.org) on my Other Writings page. It interlaces themes of sustainability and industrial ecology. The slides I used with the talk are also [posted here](http://www.johnehrenfeld.com/Lisbon%20slides.9pp.pdf). The venue was the Fifth Biennial International Conference of the Society, held in Lisbon in June, 2009. I used the occasion to announce my retirement as the Executive Director, a post I have held since the Society was founded in 2000.