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Fighting climate change by architectural design

Declan Butler has a feature (subscription required) in this week's Nature on the potential of green architecture for mitigating climate change. On his blog, he writes:

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It’s been one of the most challenging articles I’ve had to write, as I had to leave out so much, but at the same time one of the most satisfying. This is a hugely important topic. Buildings account for up to half of all energy consumption, and are the biggest single contributor to greenhouse gas emissions. Much attention is given to exotic future remedies, such as carbon sequestration and clean coal. But a way to slash emissions using existing technologies is sitting under our noses: simply rethinking how we design the buildings we live and work in, to use much less energy.

The arguments for building with energy needs met largely by marrying with the local environment and passive strategies are so compelling that the research for this article is persuading me to switch my own plans to buy a place in French Touraine, where I live, to instead build a zero-energy home — no small challenge, though, given that French builders are far behind their German, Swiss, and Austrian neighbours here.

Image: Low-income “passive” terrace houses in Lindas, Sweden; M. Wall

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Technology lessens Americans' power hunger

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Did you resolve to use less energy for your home appliances in 2008? In a study released yesterday, a lab within the the US Department of Energy found that lots of Americans (or at least lots of Pacific Northwesterners) want to do the same - and given more information, tools, and sophisticated market incentives, they'll actually do it. To the tune of 15% less peak power use and 10% lower household electric bills.

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Google turns to the dark side

Olive Heffernan

Apparently, an all white computer screen, such as an empty Word page, or the Google page, uses 74 watts to display, whereas a black screen consumes only 59 watts. So claimed Mark Ontkush in a post on the ecoIron blog in January. Doing a few back of the envelope calculations based on numbers of users per day and wattage for different coloured screen from EnergyStar, Ontkush figured that the energy saving would be 750 Megawatt hours per year if Google had a black screen.

And so, with the help of Heap Media, Google created a black version of its search engine, called Blackle.

The Wall Street Journal did some of their own calculations, which challenge the energy-saving claims of Blackle. In a blog post from May, they point out that the "savings are most likely to accrue from older CRT (cathode-ray tube) monitors, rather than the more modern, energy-efficient LCD (liquid crystal display) screens that dominate the market (representing three quarters of all monitors world-wide as of last year, by some estimates)." They did some tests using Blackle, Google and the New York Times on a CTD and LCD monitor and found the difference "so slight as to be within the margin of error for the power meter".

Since then, it's been blogged about here, here and here. Anyhow, check it out - it's certainly novel, whether or not it's especially efficient.

Olive Heffernan
News Editor
Nature Reports Climate Change