Can an all-glass office building really be considered green?

For decades, modern office buildings have been pretty much covered in glass curtain walls. Some are high performance and very expensive, like the super-green LEED Platinum Bank of America Building at 1 Bryant Park in New York, or they can be the standard crappy suburban office building thrown up across North America, looking the same in California or Calgary, according to a July 6 Treehugger article.

But as Steve Mouzon points out, even the very best glazing has an R-value that is equivalent to a 2x4 wall with fiberglass insulation, something that nobody has built for years. Most office buildings don't even approach a third of that. So why do architects design buildings this way?

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