Although the topic is unlikely to crop up in day-to-day conversation, the ongoing energy transition is commonplace. From an economic and ecological point of view, another, equally important transition is underway. However, unlike that which concerns energy, it hardly draws as much attention from media. The second major transition is about the recovery of matter. The last issue of Renewable Matter discussed the numbers at stake: every year, 50 to 60 billion tons of rock, stones, sand and gravel are mined and a further 45 billion tons of fossil fuels are extracted, whilst another 27 billion tons of biomass are moved about to produce energy. These huge quantities have mammoth environmental impacts. In addition, the increasingly irregular fluctuations of the quantities ext...