"What motivates people is emotion, not information."
The Heath Brothers wrote in a newsletter about four somewhat controversial yet highly effective strategies to motivate your team. The newsletter reveals that real motivation derives from emotion and being able to connect so much with your team that they feel that there has to be change (in other words, they are then inspired to do so). The four strategies listed are: a demonstration, photos or videos, a site visit and a designed environment.
You can read more about their four strategies here.