Bamboo and sustainability
Some weeks ago I wondered… something I do not understand is why bamboo is not used so widely in Japan as a construction material while some species are called “vegan steel” and can withstand heavy earthquakes (at least better than not-reinforced concrete). And as usual, social media can read your thoughts, and some days later, an article called “Bamboo is everywhere, but how sustainable is it?” The takeaway of this article is:
“Bamboo is a super unique plant that has the potential to be used in many industries to lower impact. But, as with any other material, it needs to be grown and harvested responsibly in order to be truly sustainable.”
A sustainability expert from Mexico also told me why bamboo should not be considered as a sustainable construction material:
It is alien to many ecosystems. Bamboo is a living being, and its worldwide usage will entail its transportation from distant places or its introduction in local ecosystems for exploitation. Both have an ecological impact which needs to be thoroughly considered. Its utilization needs to be contrasted with such impact, as well as if it does indeed successfully replace the traditional materials qualities, or not. It is endangered in its native ecosystems. Bamboo forests are dwindling, probably not out of its utilization as a building material, but this should be a red flag on the critical analysis of Bamboo in construction.
Structural resistance is not the only thing that matters. Thermal comfort, impermeability, and fire resistance, and local availability are very important factors when choosing materials. I will use the example of Adobe as I mentioned before and compare it to bamboo. Under the scorching Mexican sun, the heat is unbearable, sometimes shadows are not enough.
Adobe is a great thermal isolator, it keeps the warmth out or in, depending on the season. In order to build with adobe, it is combined with a certain kind of cane “cañamo”, whose replacement with bamboo would hardly have an impact. Adobe is earth, which is quite available in Mexico, and although it entails the use of water, it is not much. In this specific case, I deem adobe and cañamo better materials than bamboo. Adobe is fire resistant and last very long time, some rural houses made of adobe in Mexico date from the late XVIII. This is a short and incomplete example of why I stress that bamboo is an interesting solution, but not everywhere, not for every material, and not for every social sector.
So… talking about thermal comfort…
Be like Bamboo during Japanese summers
Something I heard a lot is to be like “bamboo”, be flexible, adaptive and resilient. The summers in Japan are getting more terrible. It’s not the temperature, but the humidity makes this cocktail very dangerous. I read an article of a 28 year old Japanese guy that died after sunbathing. There will be more surprises and shocks, as we cross more and more tipping points of our ecosystem (of which the fires in Siberia, Alaska, Amazons are all warning signals). Therefore, policy makers should/do not only look into reducing the impact, but also invest in climate change adaptation strategies, and preferably strategies that combine reducing and adapting the climate change effects.
Being flexible is not only applicable to climate change. This month I had this very great talk with one of my PhD advisors about being a foreigner and doing a PhD in Japan. He also comes from another country and did his PhD in our lab. He told that after two years he was still very confused, sometimes frustrated… but then just accepted he could not know everything or be part of the hierarchical system. He said I was not there yet, in that phase of letting go so I can become more flexible as bamboo, and less “stubborn as an oak” (I am soon finishing my second year). He shared this with me, to let me realise it is ok to change opinions, views etc… When you I let go certain convictions and mental models I would have more fun. However, sometimes I wonder if I would not have more fun if I lived full time in the forest 😉
Fireworks in Japanese summer
Everyone who stayed long enough in Japan, knows about “hanabi” or the fireworks. Yesterday I got to experience something real “unique Japanese” that even most Japanese or foreigners cannot experience . Friends arranged press seats to a “handmade bamboo firework festival” in Toyokawa (Aichi prefecture, one hour driving from Nagoya), because they know the people that make and do the stunt with the handmade firework. We had to sign safety declaration, got a traditional jumper et. Some people in the audience took photographs of me and thought I was also a performer. There were thousands of people, but we got place in front.
It was impressive. I had a lot of fun. Later, at a local afterparty, one of the former firework makers told me about the origins of this festival. He asked me if I know shintoism. In earlier times, Japanese were scared of nature (it reminds me to the fear Norwegians had for the forest, and lead to the belief of creatures like trolls and other spirits). To show respect, they hold rituals, of which some of them were about sacrifice.
What they do, has a lot of risk. Your heart is pounding when you are holding the handmade firework, because of it is full of gun powder. It can go wrong and explode, but happily that did not happen this edition. Later, some of them showed me their wounds on their arms and collarbones. “It is actually a bit crazy, when you think about it,” said one of them too me.
They explained me also how they made it. One month before, they cut the bamboo and “sand” it so it is smooth (which is necessary for safety). The ropes and the gunpowder have to be bought, and a professional guides them how to put the gunpowder in it. I am now more and more in a phase I want to learn how to make, fix and repair things, so I kind of said I was interested to join them next summer. That would be an epic closure of my three year long Japanese chapter.
We will see what happens. Life is full of surprises and shocks, and I will respond to what happens. I try not to plan ahead too much. Maybe be more like fire. That is the element of following your gut feeling, of energy, of doing. However, now summer is almost finishing. The Oak king’s power is fading away and my favourite season is arriving soon; autumn, where you harvest and be grateful for all the hard work, and where the colours swirl around you.