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It's no small matter. In fact, Chu says that turning all the world's roofs white would eliminate as much greenhouse gas emissions in 20 years as the whole world produces in a year. But some critics point out that in northern cities, the gain in summer could be outweighed by the loss in winter. The ideal situation, then, would be to get the advantage of white roofs when it's hot and black roofs when it's cold.Now, there may be a way to have both. A team of recent MIT graduates has developed roof tiles that change color based on the temperature. The tiles become white when it's hot, allowing them to reflect away most of the sun's heat. When it's cold they turn black and absorb heat just when it's needed.

Taking the holistic view, one can understand how some of the most basic conditions of life are threatened by a basic contradiction. Civilization, the quintessential expression of Enlightenment values that relies on ever-expanding energy, threatens to reduce humanity to barbarism if not extinction through exactly such energy production.

or every farmer or rancher who has leased his land for drilling, there are many homeowners living nearby who get nothing but the shitty end of the stick: pollution, noise and a loss of property value.

What gives the film its power is the attention paid to people like Stevens who organized petition drives and showed up at town council meetings to voice their opposition to fracking. They look like Tea Party activists or Walmart shoppers, mostly white and plain as a barn door, but they know that they do not want drilling in their townships and are willing to fight tooth and nail to prevent it. For all of the left’s dismay about its lack of power, the film’s closing credits reveal that there are 312 local anti-fracking groups in Pennsylvania made up of exactly such people who will likely be our allies as the environmental crisis deepens.

In the latest Electric Power Research Institute Journal, an article titled "Hydropower Reservoirs: A Question of Emissions" notes that reservoirs used for hydropower and for pumped-hydro energy storage are not necessarily as green as you might imagine. Or rather, they might be too green: carbon-rich organic material that accumulates on the reservoir floor can be the source of carbon emissions. A recent study of the 90-year-old Lake Wohlen, in Switzerland, for example, found high emissions of methane, as recently reported in the journal Environmental Science and Technology, in an article titled: "Extreme Methane Emissions from a Swiss Hydropower Reservoir: Contribution from Bubbling Sediments."