Michael Green: Why we should build wooden skyscrapers
February 27, 2013
Building a skyscraper? Forget about steel and concrete, says architect Michael Green, and build it out of … wood. As he details in this intriguing talk, it's not only possible to build safe wooden structures up to 30 stories tall (and, he hopes, higher), it's necessary.Michael Green
Michael Green wants to solve architecture’s biggest challenge -- meeting worldwide housing demand without increasing carbon emissions -- by building with carbon-sequestering wood instead of concrete and steel. Full bio
Double-click the English subtitles below to play the video.
This is my grandfather.
And this is my son.
My grandfather taught me to work with wood
when I was a little boy,
and he also taught me the idea that
if you cut down a tree to turn it into something,
honor that tree's life and make it as beautiful
as you possibly can.
My little boy reminded me
that for all the technology and all the toys in the world,
sometimes just a small block of wood,
if you stack it up tall,
actually is an incredibly inspiring thing.
These are my buildings.
I build all around the world
out of our office in Vancouver and New York.
And we build buildings of different sizes and styles
and different materials, depending on where we are.
But wood is the material that I love the most,
and I'm going to tell you the story about wood.
And part of the reason I love it is that every time
people go into my buildings that are wood,
I notice they react completely differently.
I've never seen anybody walk into one of my buildings
and hug a steel or a concrete column,
but I've actually seen that happen in a wood building.
I've actually seen how people touch the wood,
and I think there's a reason for it.
Just like snowflakes, no two pieces of wood
can ever be the same anywhere on Earth.
That's a wonderful thing.
I like to think that wood
gives Mother Nature fingerprints in our buildings.
It's Mother Nature's fingerprints that make
our buildings connect us to nature in the built environment.
Now, I live in Vancouver, near a forest
that grows to 33 stories tall.
Down the coast here in California, the redwood forest
grows to 40 stories tall.
But the buildings that we think about in wood
are only four stories tall in most places on Earth.
Even building codes actually limit the ability for us to build
much taller than four stories in many places,
and that's true here in the United States.
Now there are exceptions,
but there needs to be some exceptions,
and things are going to change, I'm hoping.
And the reason I think that way is that
today half of us live in cities,
and that number is going to grow to 75 percent.
Cities and density mean that our buildings
are going to continue to be big,
and I think there's a role for wood to play in cities.
And I feel that way because three billion people
in the world today, over the next 20 years,
will need a new home.
That's 40 percent of the world that are going to need
a new building built for them in the next 20 years.
Now, one in three people living in cities today
actually live in a slum.
That's one billion people in the world live in slums.
A hundred million people in the world are homeless.
The scale of the challenge for architects
and for society to deal with in building
is to find a solution to house these people.
But the challenge is, as we move to cities,
cities are built in these two materials,
steel and concrete, and they're great materials.
They're the materials of the last century.
But they're also materials with very high energy
and very high greenhouse gas emissions in their process.
Steel represents about three percent
of man's greenhouse gas emissions,
and concrete is over five percent.
So if you think about that, eight percent
of our contribution to greenhouse gases today
comes from those two materials alone.
We don't think about it a lot, and unfortunately,
we actually don't even think about buildings, I think,
as much as we should.
This is a U.S. statistic about the impact of greenhouse gases.
Almost half of our greenhouse gases are related to the building industry,
and if we look at energy, it's the same story.
You'll notice that transportation's sort of second down that list,
but that's the conversation we mostly hear about.
And although a lot of that is about energy,
it's also so much about carbon.
The problem I see is that, ultimately,
the clash of how we solve that problem
of serving those three billion people that need a home,
and climate change, are a head-on collision
about to happen, or already happening.
That challenge means that we have to start thinking in new ways,
and I think wood is going to be part of that solution,
and I'm going to tell you the story of why.
As an architect, wood is the only material,
big material, that I can build with
that's already grown by the power of the sun.
When a tree grows in the forest and gives off oxygen
and soaks up carbon dioxide,
and it dies and it falls to the forest floor,
it gives that carbon dioxide back to the atmosphere or into the ground.
If it burns in a forest fire, it's going to give that carbon
back to the atmosphere as well.
But if you take that wood and you put it into a building
or into a piece of furniture or into that wooden toy,
it actually has an amazing capacity
to store the carbon and provide us with a sequestration.
One cubic meter of wood will store
one tonne of carbon dioxide.
Now our two solutions to climate are obviously
to reduce our emissions and find storage.
Wood is the only major material building material
I can build with that actually does both those two things.
So I believe that we have
an ethic that the Earth grows our food,
and we need to move to an ethic in this century
that the Earth should grow our homes.
Now, how are we going to do that
when we're urbanizing at this rate
and we think about wood buildings only at four stories?
We need to reduce the concrete and steel and we need
to grow bigger, and what we've been working on
is 30-story tall buildings made of wood.
We've been engineering them with an engineer
named Eric Karsh who works with me on it,
and we've been doing this new work because
there are new wood products out there for us to use,
and we call them mass timber panels.
These are panels made with young trees,
small growth trees, small pieces of wood
glued together to make panels that are enormous:
eight feet wide, 64 feet long, and of various thicknesses.
The way I describe this best, I've found, is to say
that we're all used to two-by-four construction
when we think about wood.
That's what people jump to as a conclusion.
Two-by-four construction is sort of like the little
eight-dot bricks of Lego that we all played with as kids,
and you can make all kinds of cool things out of Lego
at that size, and out of two-by-fours.
But do remember when you were a kid,
and you kind of sifted through the pile in your basement,
and you found that big 24-dot brick of Lego,
and you were kind of like,
"Cool, this is awesome. I can build something really big,
and this is going to be great."
That's the change.
Mass timber panels are those 24-dot bricks.
They're changing the scale of what we can do,
and what we've developed is something we call FFTT,
which is a Creative Commons solution
to building a very flexible system
of building with these large panels where we tilt up
six stories at a time if we want to.
This animation shows you how the building goes together
in a very simple way, but these buildings are available
for architects and engineers now to build on
for different cultures in the world,
different architectural styles and characters.
In order for us to build safely,
we've engineered these buildings, actually,
to work in a Vancouver context,
where we're a high seismic zone,
even at 30 stories tall.
Now obviously, every time I bring this up,
people even, you know, here at the conference, say,
"Are you serious? Thirty stories? How's that going to happen?"
And there's a lot of really good questions that are asked
and important questions that we spent quite a long time
working on the answers to as we put together
our report and the peer reviewed report.
I'm just going to focus on a few of them,
and let's start with fire, because I think fire
is probably the first one that you're all thinking about right now.
And the way I describe it is this.
If I asked you to take a match and light it
and hold up a log and try to get that log to go on fire,
it doesn't happen, right? We all know that.
But to build a fire, you kind of start with small pieces
of wood and you work your way up,
and eventually you can add the log to the fire,
and when you do add the log to the fire, of course,
it burns, but it burns slowly.
Well, mass timber panels, these new products
that we're using, are much like the log.
It's hard to start them on fire, and when they do,
they actually burn extraordinarily predictably,
and we can use fire science in order to predict
and make these buildings as safe as concrete
and as safe as steel.
The next big issue, deforestation.
Eighteen percent of our contribution
to greenhouse gas emissions worldwide
is the result of deforestation.
The last thing we want to do is cut down trees.
Or, the last thing we want to do is cut down the wrong trees.
There are models for sustainable forestry
that allow us to cut trees properly,
and those are the only trees appropriate
to use for these kinds of systems.
Now I actually think that these ideas
will change the economics of deforestation.
In countries with deforestation issues,
we need to find a way to provide
better value for the forest
and actually encourage people to make money
through very fast growth cycles --
10-, 12-, 15-year-old trees that make these products
and allow us to build at this scale.
We've calculated a 20-story building:
We'll grow enough wood in North America every 13 minutes.
That's how much it takes.
The carbon story here is a really good one.
If we built a 20-story building out of cement and concrete,
the process would result in the manufacturing
of that cement and 1,200 tonnes of carbon dioxide.
If we did it in wood, in this solution,
we'd sequester about 3,100 tonnes,
for a net difference of 4,300 tonnes.
That's the equivalent of about 900 cars
removed from the road in one year.
Think back to that three billion people
that need a new home,
and maybe this is a contributor to reducing.
We're at the beginning of a revolution, I hope,
in the way we build, because this is the first new way
to build a skyscraper in probably 100 years or more.
But the challenge is changing society's perception
of possibility, and it's a huge challenge.
The engineering is, truthfully, the easy part of this.
And the way I describe it is this.
The first skyscraper, technically --
and the definition of a skyscraper is 10 stories tall, believe it or not —
but the first skyscraper was this one in Chicago,
and people were terrified to walk underneath this building.
But only four years after it was built,
Gustave Eiffel was building the Eiffel Tower,
and as he built the Eiffel Tower,
he changed the skylines of the cities of the world,
changed and created a competition
between places like New York City and Chicago,
where developers started building bigger and bigger buildings
and pushing the envelope up higher and higher
with better and better engineering.
We built this model in New York, actually,
as a theoretical model on the campus
of a technical university soon to come,
and the reason we picked this site
to just show you what these buildings may look like,
because the exterior can change.
It's really just the structure that we're talking about.
The reason we picked it is because this is a technical university,
and I believe that wood is the most
technologically advanced material I can build with.
It just happens to be that Mother Nature holds the patent,
and we don't really feel comfortable with it.
But that's the way it should be,
nature's fingerprints in the built environment.
I'm looking for this opportunity
to create an Eiffel Tower moment, we call it.
Buildings are starting to go up around the world.
There's a building in London that's nine stories,
a new building that just finished in Australia
that I believe is 10 or 11.
We're starting to push the height up of these wood buildings,
and we're hoping, and I'm hoping,
that my hometown of Vancouver actually potentially
announces the world's tallest at around 20 stories
in the not-so-distant future.
That Eiffel Tower moment will break the ceiling,
these arbitrary ceilings of height,
and allow wood buildings to join the competition.
And I believe the race is ultimately on.
Michael Green wants to solve architecture’s biggest challenge -- meeting worldwide housing demand without increasing carbon emissions -- by building with carbon-sequestering wood instead of concrete and steel.Why you should listen
Michael Green is calling for rapid systemic change in the way we build. To end the global housing and climate crises, we need to get past innovation-stifling regulations and well-meaning but misguided ideas popularized by mainstream media. His proposal: Forget steel, straw, concrete, shipping containers, and rammed earth. Use wood to erect urban skyscrapers. “When the Eiffel Tower was built, nobody thought it could be done. Now it’s a symbol of Paris,” Green told the Vancouver Sun. “Projects like it really triggered an innovation on how cities were built. Man moves by innovation and [by] aiming for the moon.”
Green, whose projects range from retail boutiques and housing in North America to a sustainable community in Asia, explores the plausibility of tall wood buildings -- the costs, benefits, and engineering challenges -- in an extensive 2012 white paper. The TED Talent Search winner also teaches and mentors at the University of British Columbia’s School of Architecture and Landscape Architecture (SALA).
The original video is available on TED.com