By Drew DeSilver

Seattle Times staff reporter

 Nearly 38 years after the first Earth Day, what does it mean to be green?

Maybe green means furiously pedalling a stationary bike to power a laptop or a video monitor, like the guys from Planet Green (a new cable channel launching this summer) at Saturday's Green Festival.

Or perhaps it means nibbling on organic chocolate, or buying your cat the right variety of grain-based kitty litter (both corn and wheat were on display). Or subscribing to the appropriate magazine — nearly a dozen had booths at the show, from stalwarts like Mother Jones and The Nation to newer publications such as Yes! and Plenty.

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