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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The problem with hoarding photos on your phone

Do you have hundreds (or thousands) of photos on your phone? This one's for you.

by Sharon Profis