It begins by looking at climate change and explains some of the measurements and physics principles.
Then it continues in the second part to look at nuclear fusion physics and technology, explaining some of the physics involved.
The book contains mathematics and explains things like Rayleigh-Taylor instabilities etc. in very approachable manner.
It is the perfect book for an interested layman and Prof. Chen is one of the most respected experts in the field.
[1] https://www.goodreads.com/book/show/11249163-an-indispensabl...
I studied Physics so I can't really say for sure but I imagine you would easily have sufficient skill as an economics major.
It is written for the layman and it isn't like Road To Reality by Penrose (I couldn't even understand that when I was in grad school...)