This week at TreeHugger: Stick out your thumb in the UK and you could soon find yourself riding in a hydrogen Microcab. Bulky accoutrements like roof racks can cut into your MPG, so an inflatable option could be a smart innovation. Why in the world do cars use so much fuel? It's partly all the gadgets we adore. We poll the blog electorate on what gizmos they'd happily let go of. SunRed's solar motorcycle cloaks itself in a photovoltaic hood when parked, sipping solar energy for the ride ahead. In Toronto, Smart Cars are doing street duty for the cops. The Smart Car has also touched down in the US, but it's changed, and not everyone is happy about it.

[TreeHugger's Perspective Shift roundup appears every Wednesday]