Green-tech news harvest: barter economy thrives online, solar stocks in slump

Networking sites expand for exchanging goods; courts tie coal power to carbon emissions; more bad news for bees; SUVs prices plunge; new biodiesel standards.

A sampling of green-tech news with quick commentary.

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Your Black Friday shopping survival guide

Ready to battle for deals? Bridget Carey helps you plan your strategy with tips on smartphone apps, where to find the best deals, and when to avoid the stores.

by Bridget Carey