Are you an academic who can't think what to say? Or one too idle to do your own preparation? Don't despair, Walter L has the answer(s) for you – and they're free.
Walter sent an email to his many followers (it didn't come to me) saying that preparations for the 3rd World Sustainable Development Teach-in Day on 25th March, are complete, and that over 100 powerpoint presentations from sustainability experts from across the world that were presented at WSSD-U-2014, are now on-line. These, Walt says, can be used as a basis for lectures.
In his usual under-stated fashion, W goes on to say that the Teach-in Day will "unite the global sustainability community", and "cater for all time zones". It will, it seems, be "a very special day." Huzzar!