I noticed there is no united earth tech tree, also there is no generic tech tree.
When are we going to get an option to choose tech paths for a tech tree, like from all the tech paths. Make your own tech tree for a custom faction.
Adding to what said in the past I would add up all the tech points in each path, and as you add tech paths the tech points would add up. I think the minimum would be as much as the faction with the least tech points, and the maximum would be the faction with the most tech points. you would show these points.