The slow travel movement is an off-shoot of the slow food movement.
The slow food movement advocates supporting local farmers, eating local produce and preserving regional dishes.
Slow travel is inextricably linked to sustainable travel because it focuses on meeting and supporting local people and businesses, having cultural experiences, learning bits of the local language and enjoying daily activities rather than focusing on trying to get round all the main tourist sights.
I’d like to think slow travel will grow in popularity, but Google trends shows that ‘slow travel’ now has fewer people searching than it did in 2004.