I have known it for a while now, but finally can say it publicly: I'm going to Amsterdam in October to talk about green tech thinking in Drupalcon! I also just heard the same session is accepted for Drupalcamp Helsinki held earlier this autumn.
It's been a while my last talk gig and now I have two of those upcoming still this year. I might even submit another topic for the X-con coming up at some point later during the year. And then there is still the possibility to get to talk more about the green tech on WWF meetups.