As an Australian, I am pretty well aware of Costa as both a super enthusiastic permaculturalist but also as a TV host, excellent speech giver and all-round likeable guy. This is a TEDx talk from Dubbo, Australia where Costa talks about getting children involved in gardening. His passion is infectious and I hope you get something from watching his video.
Costa is also host of Australian Broadcasting Corp. – Gardening Australia but also Costa’s Gardening World amongst others.
http://www.abc.net.au/gardening/stories/s2476106.htm
http://costasworld.org/