- https://www.thelocal.de/20190618/why-this-german-city-plans-to-make-public-transport-free
- https://ourworldindata.org/world-population-growth-past-future
- https://daniel.haxx.se/blog/2019/06/19/google-to-reimplement-curl-in-libcrurl/
- https://en.wikipedia.org/wiki/Milankovitch_cycles
- https://www.reuters.com/article/germany-housing-rent-cap-idUSS8N20O06F
- https://science.sciencemag.org/content/early/2019/06/19/science.aau8712.full
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