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--- blog:sustainability_ideas [2019/12/20 21:01] – [Population] jannis
+++ blog:sustainability_ideas [2020/05/31 22:10] (current) – [Transportation] jannis
@@ Line 12: / Line 12: @@
 For any type of fast transportation through earth's atmosphere, drag (air
 resistance) will be important. The drag force is roughly proportional to the
-velocity squared times the surface area of the moving object. So we should move
+velocity squared, the surface area of the moving object and the air density. So assuming we won't have [[https://en.wikipedia.org/wiki/Hyperloop|Hyperloops]] any time soon, we should move slowly, with a small surface area, ideally in a vehicle with a small drag coefficient. Some simple ways to make travel more energy efficient are:
-slowly, with a small surface area.
   * Reduce the maximum speed of cars to say 60 km/h

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