Let's talk about thrift. Thrift is a concept where you reduce, reuse and recycle, but yet with an economic aspect I think has a real potential for change. My grandmother, she knew about thrift. This is her string jar. She never bought any string. Basically, she would collect string.It would come from the butcher's, it would come from presents. She would put itin the jar and then use it when it was needed. When it was finished, whether it was tying up the roses or a part of my bike, once finished with that, it'd goback into the jar. This is a perfect idea of thrift; you use what you need, you don't actually purchase anything, so you save money.
Kids also inherently know this idea. When you want to throw out a cardboard box, the average kid will say, "Don't! I want touse it for a robot head or for a canoe to paddle down a river." They understand the value of the second life of products. So, I think thrift is a perfect counter point to the current age which we live in. All of our current products are replaceable. When we get that bright, new, shiny toy, it's because, basically, we got rid of the old one. The idea of that is, of course,it's great in the moment, but the challenge is, as we keep doing this, we're going to cause a problem.
That problem is that there is really no way. When you throw something away, it typically goes into a landfill. Now, a landfill is basically something which is not going to go away, and it's increasing. At the moment, we have about 1.3 billion tons of material every year going into landfills. By 2100, it's going to be about four billion tons. See, instead, I'd prefer if we started thrifting. What that means is, we consider materials when they go into products and also when they get used, and, at the end of their life: When can they be used again? It's the idea of completely changing the way we think about waste, so waste is no longer a dirty word -- we almost remove the word "waste" completely. All we're looking to is resources.Resource goes into a product and then can basically go into another product. Weused to be good at thrifting. My grandmother, again, used to use old seed packets to paper the bathroom walls.
I think, though, there are companies out there who understand this value and are promoting it. And a lot of the technologies thathave been developed for the smart age can also be adapted to reduce, reuse and also thrift more proficiently. And as a materials scientist, what I've been tracking over the last couple of decades is how companies are getting smart atthrifting, how they're able to understand this concept and profit from it. I'm going to give you two examples. The first one, a good one; the second one, not so good.
The first is the automotive industry. Not always known as the most innovative or creative of industries, but it turns out,they're really, really good at recycling their products. Ninety-five percent ofevery single car that goes on the road gets recycled here. And of that car,about 75 percent of the entire car actually gets used again. That includes, of course, the old steel and aluminum but then also the plastics from the fender and the interiors, glass from the windows and the windshield and also the tires. There's a mature and successful industry that deals with these old carsand basically recycles them and puts them back into use as new cars or other new products. Even as we move towards battery-powered cars, there are companies that claim they can recycle up to 90 percent of the 11 million tons of batteries that are going to be with us in 2020. That, I think, is not perfect,but it's certainly good, and it's getting better.
第一个例子是关于汽车制造业的。没有多少人会认为这是一个极具创新的产业，而事实上，这个产业在回收再利用方面做得十分出色。所有在路上跑的汽车中，有95% 都会被回收循环使用。而每辆车75%的部分又会被回收重新使用。回收的部分包括，废弃的钢和铝，还有那些来自挡泥板和汽车内部的塑料制品，车窗玻璃和挡风玻璃，以及轮胎。有一个成熟的、成功的产业，专门处理报废车辆，对它们进行回收，并重新利用到新的汽车或其他产品中去。甚至我们的电动汽车，一些公司宣称，它们最多可以回收再利用到 2020 年所生产的 1100 万吨电池中的90%。我认为，这并不完美，但已经非常不错了，而且还有改善的空间。
The industry that's not doing so well is the architecture industry. One of the challenges with architecture has always been when we build up, we don't think about taking down. We don't dismantle, wedon't disassemble, we demolish. That's a challenge, because it ends up that about a third of all landfill waste in the US is architecture. We need to think differently about this. There are programs that can actually reduce some of this material.
A good example is this. These are actually bricks that are made from old demolition waste, which includes the glass, the rubble,the concrete. You put up a grinder, put it all together, heat it up and make these bricks we can basically build more buildings from. But it's only afraction of what we need.
My hope is that with big data and geotagging, we canactually change that, and be more thrifty when it comes to buildings. If there's a building down the block which is being demolished, are there materials there that the new building being built here can use? Can we use that, the ability to understand that all the materials available in that building are still usable? Can we then basically put them into a new building, without actually losing any value in the process?
So now let's think about other industries. What are other industries doing to create thrift? Well, it turns out that there are plenty of industries that are also thinking about their own waste and what we can do with it. A simple example is the waste that they basically belch out as part of industrial processes. Most metal smelters give off an awful lot of carbon dioxide. Turns out, there's a company called Land Detector that'sactually working in China and also soon in South Africa, that's able to takethat waste gas -- about 700,000 tons per smelter -- and then turn it into about400,000 tons of ethanol, which is equivalent to basically powering 250,000, orquarter of a million, cars for a year. That's a very effective use of waste.
让我们再想想其他行业。其它行业是如何节俭的呢？现在许多行业都在思考如何解决生产废料这个问题。一个简单的例子，就是在工业生产中排放的工业废气。许多金属冶炼厂会在生产中排放大量的二氧化碳。我发现一个叫 Land Detector 的公司在中国和南非开展工作，他们搜集工业废气——一个冶炼厂可以搜集70万吨废气——这些废气能转换成40万吨乙醇，这相当于给25万量汽车提供了一年的燃料。这是有效利用生产废料的方法。
How about products more close to home? This is a simple solution. And it, again, takes the idea of reducing, reusing, but then also with economic advantage. So it's a simple process of changing from a cut and sew, where typically between 20 and 30 materials are used which are cut from a large cloth and then sewn together or even sometimes glued, they changed it and said that they just knitted the shoe. The advantage with this is not just a simplification of the process, it's also, "I've got one material. Ihave zero waste," and then also, "I'm able to potentially recyclethat at the end of its life."
Digital manufacturing is also allowing us to do this more effectively. In this case, it's actually creating the theoretical limit of strength for a material: you cannot get any stronger for the amount of material than this shape. So it's a basic simple block, but the idea is, I can extrapolate this, I can make it into large formats, I can make it into buildings, bridges, but also airplane wings and shoes. The idea here is, I'm minimizing the amount of material.
Here's a good example from architecture. Typically,these sorts of metal nodes are used to hold up large tent structures. In this case, it in was in the Hague, along a shopping center. They used 1600 of the materials on the left. The difference is, by using the solution on the right,they cut down the number of steps from seven to one, because the one on the left is currently welded, the one on the right is simply just printed. And itwas able to reduce waste to zero, cost less money and also, because it's madeout of steel, can be eventually recycled at the end of its life.
Nature also is very effective at thrift. Think aboutit: nature has zero waste. Everything is useful for another process. So, inthis case, nanocellulose, which is basically one of the very fine building blocks of cellulose, which is one of the materials that makes trees strong, youcan isolate it, and it works very much like carbon fiber. So, take that from a tree, form it into fibers, and then those fibers can strengthen things, such as airplanes, buildings, cars. The advantage of this, though, is it's not just bioderived, comes from a renewable resource, but also that it is transparent,so it can be used in consumer electronics, as well as food packaging. Not bad for something that basically comes from the backyard.
Another one from the biosource is synthetic spidersilk. Now, it's very hard to actually create spider silk naturally. You canbasically get it from spiders, but in large numbers, they tend to kill eachother, eat each other, so you've got a problem with creating it, in the sameway you do with regular silk. So what you can do is instead take the DNA fromthe spider, and put it into various different things. You can put it intobacteria, you can put it into yeast, you can put it into milk. And what you cando then is, the milk or the bacteria produce in much larger volumes and thenfrom that, spin a yarn and then create a fabric or a rope. Again, bioderived,has incredible strength -- about the same as Kevlar -- so they're using it inthings like bulletproof vests and helmets and outdoor jackets. It has a greatperformance. But again, it's bioderived, and at the end of its life, itpotentially can go back into the soil and get composted to again be potentiallyused as a new material.
I'd like to leave you with one last form which isbiobased, but this, I think, is like the ultimate thrift. Think about theposter child for conspicuous consumption. It's the water bottle. We have toomany of them, they're basically going everywhere, they're a problem in theocean. What do we do with them? This process is able not just to recycle them,but to recycle them infinitely. Why is that interesting? Because when we thinkabout reusing and recycling, metals, glass, things like that, can be recycledas many times as you like. There's metal in your car that may well have comefrom a 1950s Oldsmobile, because you can recycle it infinitely with no loss ofperformance. Plastics offer about once or twice of recycling, whether it's abottle, whether it's a chair -- whatever it is, if it's carpet -- after two timesof recycling, whether it goes back into another chair, etc, it tends to losestrength, it's no longer of any use. This, though, just using a few enzymes, isable to recycle it infinitely. I take a bottle or a chair or some other plasticproduct, I basically put it in with a few enzymes, they break it apart, theybasically put it back into its original molecules. And then from thosemolecules, you can build another chair or carpet or bottle. So, the cycle isinfinite. The advantage with that, of course, is that you have potentially zeroloss of material resources. Again, the perfect idea of thrift.
So in conclusion, I just want to have you thinkabout -- if you make anything, if you're any part of a design firm, if youbasically are refurbishing your house -- any aspect where you make something,think about how that product could potentially be used as a second life, orthird life or fourth life. Design in the ability for it to be taken apart.That, to me, is the ultimate thrift, and I think that's basically what mygrandmother would love.
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