What's the relationship between communication and behaviour change - in particular, changing our behaviour around environmental waste? Kim Borg from the Sustainable Development Institute at Monash University talks about the positives and negatives of using humour in socal marketing campaigns. Then Louise Kolff, specialist in visual communication and information graphics, explains how shock and shaming campaign strategies aren't the best way to get people on board to make positive changes to littering behavior, and the habituated use of plastic bags.