Oven stoves are greener, more efficient, healthier, safer and cosier than all modern heating systems. Why are they gone and how do we get them back?
The craftsmanship associated with timbrel vaulting has long vanished, but the achievements are still with us today.
LEDs introduce lighting in places and situations where there was no lighting before.
If we cut the average speed of all vehicles by half, fuel consumption would decrease by a whopping 75 percent.
A small windmill on your roof or in the garden is an attractive idea. Unfortunately, commercially available micro wind turbines deliver hardly enough energy to power a light bulb. Their financial payback time is much longer than their life expectancy and in urban areas they will not even deliver as much energy as was needed to produce them.
Narcís Monturiol successfully resolved the two basic obstacles presented to submarine inventors: air supply and mechanical power.
Why introduce yet another expensive, energy-intensive and risky technology if there are so many other and better ways of fighting global warming?
In spite of all the high-tech that has been squeezed into cars, the 2CV from 1949 is still more energy efficient than the smallest Citroen today.
If we would stuff people in the ‘Queen Mary 2’ like we fold passengers into airplane seats, the ship could transport more than 500,000 people
What will remain of greentech, cleantech and ecotech if nanotechnology turns out to be harmful for humans and the environment?
Fast and complicated calculations are a product of fossil fuels.
Build a pinhole camera, turn your bedroom into a camera obscura, and rediscover photography.