Jun 25, 2015

How We Make Cars Is a Bigger Environmental Issue Than How We Fuel Them

Around two billion cars have been built over the last 115 years; twice that number will be built over the next 35-40 years. The environmental and health impacts will be enormous. Some think the solution is electric cars or other low- or zero-emission vehicles. The truth is, if you look at the emissions of a car over its total life, you quickly discover that tailpipe emissions are just the tip of the iceberg.

An 85 kWh electric SUV may not have a tailpipe, but it has an enormous impact on our environment and health. A far greater percentage of a car's total emissions come from the materials and energy required for manufacturing a car (mining, processing, manufacturing, and disposal of the car ), not the car's operation. As leading environmental economist and vice chair of the National Academy of Sciences Maureen Cropper notes, "Whether we are talking about a conventional gasoline-powered automobile, an electric vehicle, or a hybrid, most of the damages are actually coming from stages other than just the driving of the vehicle." If business continues as usual, we could triple the total global pollution generated by automobiles, as we go from two billion to six billion vehicles manufactured.

The conclusion from this is straightforward: how we make our cars is actually a bigger environmental issue than how we fuel our cars. We need to dematerialize — dramatically reduce the material and energy required to build cars — and we need to do it now.

These facts are demonstrated in a 2009 report by the National Academy of Science, Hidden Costs of Energy: Unpriced Consequences of Energy Production and Use. That report considers the total human and environmental damage stemming from the various stages of automotive use: the manufacture of the vehicle, the manufacture of the vehicle's fuel, and the operation of the vehicle. The chart below illustrates that tailpipe emissions are only a small part of the total emissions picture:

cost of manufacturing the fuel and vehicle

Thus, the prevailing marketing and policy focus on drivetrains (e.g. gasoline vs. electric) has clouded the debate and drawn attention away from the larger problem: the emissions and other environmental damage stemming from the manufacturing of cars.

Dematerialization is the only effective path for reducing the environmental damages stemming from automobiles. Dematerialization will lead to:

  • Far fewer emissions from both manufacturing and operation
  • Much lower material and energy inputs in manufacture
  • Dramatically better gas mileage
  • Lower wear on roads
  • Fewer fatalities from car accidents

We need to focus our innovation not simply on automobile products, but in equal amounts on the process by which those products are made. Such process innovation needs to accomplish two equally important goals:

  • Dematerialization of our cars: dramatically reducing material and energy inputs and waste
  • Democratization of car manufacturing: giving small teams a set of affordable tools to enable them to design, build, and scale a wide range of complex vehicle structures.

Letting the little guy create: Democratizing manufacturing

To dematerialize manufacturing, we first need to democratize it. Traditional automakers are held captive by the massive capital investments required to build cars using traditional methods. Every one of today's car companies, from Toyota to Tesla, has invested hundreds of millions of dollars in every car factory it has built. That means they must organize everything they do around generating a maximum return on that huge fixed-cost investment. As industry analyst Horace Dediu observes: "Production is everything. Capacity utilization is the first priority for an auto manufacturer. Capacity is why firms are not allowed to die and entrants are not allowed to enter. If you want to find the Next Big Thing in automobiles, look for a new production system."

Democratizing car manufacturing requires that small teams have a set of affordable tools enabling them to make cars of their own design. Such a tool set would empower people in car manufacture the same way Arduino empowered people in electronics. Arduino's modular platform hides its complexity behind an easy-to-use interface, which created an explosion of hardware and software innovation. Because of Arduino, many of the latest tech products in the Internet of Things — from Kickstarter devices to home automation — have been built not by huge corporations, but by small, nimble teams.

Divergent Microfactories set out to build an industrial-strength Arduino for cars — a kind of "Carduino." The key enabling technology we've developed is what we call a "Node." A Node is a 3D-printed alloy connector that joins aerospace-grade carbon fiber tubing into standardized building objects. This simple tool allows a small team to design and build car chassis that range from two-seat sports cars to pickup trucks. Just like the Arduino, the Node hides its underlying complexity behind a simple, easy-to-use interface.

Small teams using fewer materials: Democratizing meets dematerializing

The Node-based chassis solves the bigger problems we set out to address. It drives both dematerialization and democratization. A traditional chassis can weigh more than 1,000 pounds, whereas Divergent Microfactories has built a prototype that weighs about 100 pounds (61 pounds of aluminum and 41 pounds of carbon fiber), and is much stronger and more durable. All of the nodes and carbon fiber tubing that make up a car chassis fit into the backpack in the photo below. The chassis requires dramatically less material and energy to produce.


All of the nodes and carbon fiber tubing that make up a car chassis fit into this backpack. Image courtesy of Kevin Czinger.

A dematerialized car is a greener, lighter, and safer car that can be made locally. It will cause less wear on roads and fewer fatalities in accidents. A super-lightweight car built with this technology generates only a third of the total health and environmental damage of an 85 kWh all electric car. The objective: drive that down to a quarter or less. And it can be made locally and built to last.

light-weight DM vehicle