For the first time since 1998, Honda is no longer considered the "Greenest Automaker." Instead, Hyundai-Kia took the "Greenest Automaker" prize this year.
Interested in going green with your next car purchase? Be sure to read these common myths about eco-friendly vehicle gas mileage first.
Large companies may be willing to pay for their emissions. Major companies including Walmart, American Electric Power and the five major oil companies have all incorporated carbon emission costs into their financial plans, according to a report by environmental data company CDP.
Coal may make electric cars dirtier to run in the short term, Voelcker writes. But, in the long term, its electric cars that help make the case for rendering coal obsolete.
Planetary carbon dioxide concentrations are the highest they've been in the past 800,000 years, an ignominious milestone for Earth Day 2013. Still, the world is making some progress toward addressing global warming.
States, not Congress, are taking the lead on climate change laws – from a new cap-and-trade program in California to widespread adoption of renewable electricity standards. Moves to weaken those standards aren't gaining traction in state capitals.