Is Elon Musk Goal REALISTIC? 1 million people by 2050

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Being excited for the future of human expansion in space I was curious to understand how much effort is necessary to make things possible. After weeks of research, I was shocked to find out that there are much bigger problems when it comes to farming on mars than just soil, bacteria, fertilizer, and gravity.
Forget about everything you heard so far. How scientists were able to grow crops under “Martian conditions” on Earth. Farming on mars is a much bigger setback than I previously thought, and the 1 million people mark depends entirely on this possibility.
In this video we will dive deeper into what it really takes to farm on mars beyond what has been already discussed. And why 1 million people on mars by 2050 maybe unrealistic.

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References
Methanation
https://www.storeandgo.info/demonstration-sites/germany/index.html
http://www.helmeth.eu/index.php/technologies/methanation-process
https://learn.openenergymonitor.org/sustainable-energy/energy/sabatier-process
Growing plants vertical farming
https://ifarm.fi/blog/2020/12/how-much-electricity-does-a-vertical-farm-consume
Solar Energy
https://explainingscience.org/2019/03/09/solar-energy/
Agricultural carbon sequestration
https://www.yankton.net/life/article_eb501b0e-bc32-11e6-9285-03d7368af7c0.html
Cryocooler
https://www.sunpowerinc.com/-/media/project/ameteksxa/sunpower/ameteksunpower/updated-datasheets/sunpower-cryotel-mt-datasheet.pdf?la=en&revision=281ce19c-1b5d-4522-a8d7-efd607f66163&hash=2C295D8BBC61C20D7775E9199AD7FB42

Softwares Used:
Blender 2.8 EEVEE
Apple Motion
Final Cut Pro X