A fireless cooker doubles the efficiency of any type of cooking device because it shortens the time on the fire and limits heat transfer losses
About a quarter of the existent wind turbines would suffice to power as many electric velomobiles as there are people.
Almost all of the leading economies in Western Europe during the last millenium relied on a large-scale use of fossil fuels such as peat and coal.
The human power required to achieve a speed of 30 km/h in a velomobile is only 79 watts, compared to 271 watts on a normal bicycle.
Estimates about the fuel efficiency of aircraft ignore the record of the pre-jet era.
Increasing the share of renewable energy will not make us any less dependent on fossil fuels as long as total energy consumption keeps rising.
Fast recharging times generate lots of excitement, but what seems to be forgotten is that they can lead to a fabulous amount of peak demand.
LEDs introduce lighting in places and situations where there was no lighting before.