To be fair, in this case we were sucking the air out of the 120 m high tube :)

You can watch the videos in the linked paper. They look fascinating and highlight the occurring problem not having buoyancy in space :)

I just wondered if 15% of the cropland currently used for growing biofuel in Europe is replaced with solar, these countries could potentially reduce nitrogen levels in soil and groundwater caused by overfertilization to normal levels. Also reduce fertiliser productions and dependency on seasons.

Is there a simple way to calculate how much nitrogen in the soil would be reduced by using solar energy instead of biomass as a fuel?

I read that production of one SUV is the equiv. of 15 transatl. flights incl returns. Middle class in 🇩🇪 changes these kind of cars every 3 years. That’s why I can’t imagine the pie chart being representative for the avg German. I suppose flying is a minor issue. www.theguardian.com/environment/...

Thx for the clarification, but I don’t think the pie represents eg 🇩🇪. Avg car is 6.2 years old & more resource-hungry cars like SUVs have a high turnover due to tax benefits & leasing. There are also as many cars as people over 18 y/o. I can’t see how flying is even comparable to driving (in 🇩🇪).

If I'm driving a car, are my personal annual CO2 emissions only calculated based on fuel emissions, with the car's production being outsourced to another listing, such as the right pie?

Global positioning satellites (GPS, Galileo) are highly precise clocks to account for the effects of both special and general relativity, which cause differences in the passage of time.
Correct positioning needs time scales of nanoseconds and relativity causes dilations 1000 times bigger.

I wonder if it would still be possible to launch satellites into low cube earth orbit (LcEO) from the edges, since the friction of shooting up does not have to be overcome, and use the gain in payload capacity for propellant to compensate for the energy gain or other systems such as big solar sails.

Same. Ich hatte es glaube ich in drei Sitzungen schon durch. Aber es gibt so viele großartige Geschichten, dass es sich kaum lohnt, ein Buch zweimal zu lesen.

Wie wäre mit einem Buch als Kompensation für die Pause? Schon Project Hailmary von Andy Weir (The Martian) gelesen oder gehört?