I recently started playing kittens game again and now I have some thorium? How do you create thorium? I'm just a monkey pushing buttons.
Thorium is created by refining Uranium in the Workshop Tab.
I believe you need to research Thorium Technology before being able to get Thorium.
It will show up in the workshop once you have Uranium (typically generated by Accellerators in early game or traded with the Dragons)