Green-tech news harvest: Turning CO2 to stone, health problems with Priuses?

Senate hears from ethanol experts; new microbes for biofuels; a profile of Masdar City; scientists look to liquify and petrify CO2 for storage; the lowdown on carbon trading;

A sampling of green-tech news.

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The problem with Amazon Dash buttons

Limits on choice mean new shopping gadget won't click for everyone. Bridget Carey explains how the buttons work, and the rule changes for sharing your Prime perks with others.

by Bridget Carey