I found these videos very interesting:

https://www.youtube.com/watch?v=svNg5w7WY0k&t=5s

This is on my to-do list:

http://climatechangeacademy.com/courses/carbon-removal/4

https://bootup.airminers.org/

I found a lot of information from comments here:

https://news.ycombinator.com/item?id=27822694