You wait a while for a good book and then two come along at once.
I attended the UK launch of two different books relevant to you this week, the first was ‘Sustainable Cities – Assessing the Performance and Practice of Urban Envrionments’ edited by Pierre Laconte and Chris Glossop and published by I.B.Tauris ISBN 978-1-78453-232-1.
This is a portmanteau publication, containing a number of chapters written by other authors, some of which will have been published elsewhere in some form, but not all together as in this case, and not carefully considered for their relevant to this important topic.
The question of sustainable cities, what defines them, what standards allies to them, how do we choose indicators to assess the, and when we build them how do we know we have succeeded, are all questions tackled by authors in this publication. Given that we have now passed the point at which 50% of the worlds population lives in cities, there is hardly a bigger question for sustainability specialists to work on. If we can crack this, we can avoid runaway climate change.
Authors include Dr. Kerry Mashford, the late Sir Peter Hall, Chris Glossop and Dr Ian Douglas.
I also attended a lecture given by architect Stefano Boeri on his recent project in Milan, Bosco Verticale. The event was hosted by the Engineering Club at the Congress Centre. (A few architects turned up)
Bosco Verticale translates to Vertical Forest, and his two buildings in Milan, evenly constructed for Hines, and then sold on to Qatari Diar, demonstrate what he means by this. Each apartment has a tree on the balcony, several metres tall, together wth a quantity of shrubs and smaller plants. The publication ‘un Bosco Verticale, a vertical Forest- instructions booklet for the prototype forest city’ published by Corraini, ISBN 9-788875-705411 was available on the night and furnishes a lot of background information to the project including the following numbers.
The project provides two hectares of forest and 8900 Sqm of balcony area.
This includes 711 trees, 5,000 shrubs, 15,000 perennials, absorbing 19,825kg of CO2 per annum.
There are approximately 1600 birds and insects (although how they could know this is not explained!) This includes a box of ladybirds imported from Germany to eat aphids and other pests. (I don’t know why they needed Germany ladybirds)
The design uses 94 species of plants, giving it a very high level of biodiversity.
The trees are planted in steel-lined planters to prevent the roots cracking the structure, and they are loosely tied back to the structure in case they could be blown off iin hurricane level winds. The steel-linings will also constrain the growth of the trees so that they cannot get too big for the space available or too heavy for the structure. They are a bit like enormous bonsai trees. They are maintained partially from the balconies, but the outer sides are pruned by gardeners that abseil down the outside of the buildings twice a year. While this might sound outlandish, consider that many glass buildings are routinely maintained by abseilers.
The result is extraordinary, a pair of buildings that look like no others, and a second project is underway in France. Stefano was quite straightforward in admitting that it took some time and a lot of effort to convince his clients that this could work. There are elements of what was built that he will change the second time, and he has plans to continue to develop the idea on a larger scale.
He was asked many times by the audience about squirrels, which he was not in favour of, but which he expected to arrive anyway, and also about fruit trees, as none of the species used are fruiting trees. He cited concerns about the dangers of falling fruit as the reasons why they weren’t used. This sounds to me like a problem that could be solved, and would add a further beneficial dimension to what is already a beautiful and convincing idea.
This is an inspiring idea and one that merits your attention.