Portland gets greener

Paralyzed rats walk again with help from scientists

MNN and Dell Mini Netbook Sweepstakes Official Rules

Researchers tracing trash

Wheego raises $1.2 million, plans for growth

Diesel: Could an old fuel become the new 'hybrid-killer'?

Electrical device plugs directly into trees for power

In the Green Room: Chuck's biodiesel explainer, part one

The Flying Dutchman: Teen flies homemade pedal-powered plane

Can space travel save the planet?

Now it's even easier to offset the CO2 from that private jet

Why Cash for Clunkers was like a methadone clinic