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--- blog:sustainability_ideas [2019/05/03 21:48] – [Transportation] 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
@@ Line 25: / Line 24: @@
   * Make contraception free of charge everywhere.
   * Provide tax or financial incentives for sustainable family sizes -- depending on the region/country.
-  * It's not only about the number of people, but also about how much resources are consumed. I'm pretty sure we would all happily fly a helicopter or private jet if we were able to.
+  * It's not only about the number of people, but also about how many resources are consumed. I'm pretty sure we would all happily fly a helicopter or private jet if we were able to.
 ==== Energy production =====

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