Here's how the next 20 years are shaping up in terms of energy, and what it means for global warming.
The midterm elections brought in a new wave of governors with aggressive plans to cut emissions and expand low-carbon energy. Now, those plans are being implemented.
Some states, concerned about pollution and global warming, see school buses as the next frontier for electric vehicles. Prices are high, but that's starting to change.
A growing number of analysts say pessimism about plug-in cars could be becoming outdated, thanks in part to plunging battery prices.