Green news harvest: Doubts on plankton climate fix

Researchers find that seeding ocean with iron to feed plankton and sequester carbon has flaws, while debate continues over land use affects carbon emissions from ethanol.

A sampling of green-tech news with quick commentary.

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We pummel the powder in Nissan's Winter Warrior concepts

Equipped with suspension lifts and actual tracks, these concepts are meant to reach places that no ordinary vehicle can.

by Jon Wong