Analysis: Why can't we 'phase out' fossil fuels? Lego troubles help provide answer
By Ed Conway, data and economics editor
The last-minute deal agreed at the COP28 summit in Dubai to move away from fossil fuels is being heralded as a major breakthrough.
But while it's the first time these annual climate negotiations have agreed to reduce our reliance on coal, oil and gas, it stops short of what many campaigners had been demanding: a promise to phase out fossil fuel use altogether.
Which raises a question: why? Why couldn't the meeting go one step further and promise to leave all fossil fuels in the ground?
Perhaps the best answer begins somewhere unexpected: with a piece of Lego.
Most Lego bricks are made of a plastic called Acrylonitrile Butadiene Styrene, or ABS for short. It's a tough thermoplastic, which is to say one of those plastics you can melt down and form back into other shapes again, and it's brilliant at doing all the things Lego bricks need to do.
It's incredibly durable. It can be moulded precisely, with tolerances of within four microns, meaning one brick fits neatly into another.
Finally, it has pretty unbeatable "clutch power", as the company calls it: the bricks stick together robustly but are also pretty easy to pull apart.
But ABS is made, like nearly all plastics, out of chemicals derived from oil and gas.
A few years ago Lego committed to trying to make its blocks not directly from oil but from other feedstocks. After much work it eventually settled upon old plastic bottles - or recycled polyethylene terephthalate, to use the technical term. But, try as it might, it struggled to make this RPET work as well as ABS. The only way to make it perform as well as the old brick - the rigidity, the accuracy, the "clutch" - was to process it and reprocess it, adding a host of additional materials along the way.
A few months ago, it revealed that in practical terms its efforts thus far had failed. Ironically enough, it took more energy to turn those recycled bottles into bricks than it did to take oil and turn it into bricks.
Now, it's still relatively early days. But Lego's efforts are a pretty good reminder of something pretty profound. Like it or not, fossil fuels are remarkably good at what they do.