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This week at TreeHugger: Detroit is all cars this week. TreeHugger waded through the auto show and hunted down the greenness. Hybrids (yes, all of them) really do save you money, a new study shows. Satellite navigation systems may soon offer drivers the most eco-friendly route from A to B. TreeHugger looks back on some of the cleanest concept cars to grace our temptation last year. Surface Magazine rounds up boys' toys, including bubbly electric cars and zippy electric bikes.

[TreeHugger's Perspective Shift roundup appears every Wednesday]