Treehugger is one of those dichotomous sites (probably due to the variety of bloggers) that seems to contradict itself on a daily basis - particularly in response to green roofs. While simulataneously promoting the newest in Veg.itecture, occasionally they drop a 'cautionary' tale about the need for some reflection beyond the visual. A recent post definitely made me think of this duality.
Via
Treehugger:
"This used to be the vision of the future of green roofs: Conventional architecture with a green lid. It is turning out very differently, as green roof technology changes the role of the architect, the way they design buildings, the way they present them, and the places they put them. Like every other tool, there is the potential for abuse. Are green roofs being used as a form of "greenwrapping" to put buildings where they shouldn't be? Or are they actually creating opportunities for better planning?"The post goes on to present a range of projects in the genre, with some interesting dialogue. I have to call absolute bullshit with this particular nugget:
"Green roofs came into their own early in the decade, primarily due to the great work of Steven Peck and Green Roofs for Healthy Cities; They turned it into a movement, "to increase the awareness of the economic, social, and environmental benefits of green roof infrastructure. By 2003 they were even running awards programmes" While I respect the 'work' of GRHC, there's a lot of people, municipalities and organizations responsible for the adoption of the idea - and really very few of that has to do with this particular organization of Mr. Peck. It takes a village - not a trade organization. It's probably made a bunch of companies rich, but not necessarily made a movement.

The dialogue goes on to question the validity of the Vancouver Convention Centre as opposed to a previous design: "They are showing up everywhere, even when they don't quite fit the architectural idiom. The new green roof at the Vancouver Convention Centre is big and on its own a lovely thing. But an earlier phase of the Convention Centre, designed by Canadian great Eberhard Zeidler, was designed to be light, airy, and to create a dramatic profile reminiscent of sails. How does a green roof compare?"

So how does a green roof not fit an architectural idiom? The building is enormous, and I've seen the sails proposal which borders on the cliche. Oh, we're by the water, let's use sails. More appropriate is the fact that edges of water are usually diverse ecosystems, particularly vegetated, and in keeping with the natural and greenly urban character of Vancouver. Perhaps what we need is some questioning of water-adjacent 'sails' as an architectural idiom. The idea is furthered with the questioning of the concept of a non-building for the stunning (yet monocultural) Nanyang University School of Art Design and Media: "It is a lovely green roof, but nobody can call it a "non-building building", it is as real as any other building on campus unless you work for Google Maps. Would Kenzo Tange have approved? Or are green roofs being used to put a new green sheen on projects that might otherwise have been more problematic to get approved?"

I'm with them on this point, but this particular project is not the example to use. The overall footprint of the building is relatively minimal, and the fact that it's accessible is at least a step in the right direction. Greenwrapping exists - particularly in the visualization phase, but c'mon, pick the right targets - like golf courses atop water treatment plants.
:: image via TreehuggerA few more examples in the slideshow, and the summary:
"Perhaps to everyone's surprise, they have turned into planning tools to help put buildings where no building has gone before, are radically changing the architectural form of buildings, the way architects present buildings (see the rash of aerial perspectives-who ever showed rooftops before?) and the respective roles of architects and landscape architects."Is this a problem? The so-called fifth-facade, or more aptly, the forgotten facade has long been given up to ugly and specifically utilitarian desires. Who would want to show the roof of a typical building, with HVAC, and gravel ballast offering nothing to community or building. Don't get me wrong, I think these sort of speculative endeavors via blog are useful, but there's a mixed-message at play.
On a related note, outlining a future scenario that may come to pass, The always solid
BLDGBLOG offers a great complementary neo-historical view of rooftop greening (and a shout-out to this blog). The post 'The Hollow Hills' provides a fascinating story that I can see coming out 1000 years from now, when buildings are enveloped and forgotten in their vegitectural context...
:: image via BLDGBLOG