Other seminars and courses are available in many different areas that cover a variety of topics. Try to make it a point to find an event where the speaker plans on talking about sustainability near you, and register to attend. Make sure you take a notebook with you, so you can jot down some of the things that are discussed.
There are also print magazines dedicated to sustainable living. While you can subscribe and have them sent to you, some publications make digital copies readily available. Because of free video hosting sites such as YouTube, educational videos on sustainability are relatively easy to find on the internet as well.