The relatively high cost of renewable energy is what's keeping us dependent on dirty-and dirt cheap-coal power. I mean, putting out $40,000 for something that's not a necessity isn't too appealing to most Americans right now.

But what if solar and wind were as cheap to harness for energy production as coal? There would be very little argument left against a wholesale shift to renewables (regardless of how much kicking and screaming the coal industry would undoubtedly do).

That time may not be too far off, according to a report delivered by Vice President Joe Biden on the future of innovation in America . The report covers transportation and medicine, as well as renewable energy.

We like to occasionally bring your attention to green promos . With all the greenwashing companies are doing these days, there's always a bunch to sort through. Here's one that truly sounds cool: Coca-Cola's "America is Your Park" campaign.

All things being equal, why not stay in a hotel that makes an effort to reduce its footprint? You'll sleep better knowing your stay is contributing to the Earth's degradation just a little bit less.

The speed with which summer passes can be measured this year, depressingly, by the Gulf oil spill. Can you believe we're closing in on four months since the start of the disaster?

I'm a skeptic. Plus, I like to act like a journalist from time to time (despite what one particularly ornery Green Among Gray reader had to say).