In the There's No Tomorrow video, they affirm several things about solar panels (and a lot of other things).
The one I'm the most curious about is this:
All the world's photovoltaic solar panels generate as much electricity as two coal power plants. The equivalent of between 1 and 4 tons of coal are used in the manufacture of a single solar panel. […]
The main question I'm interested about is the second sentence: Does it really require 1 to 4 tons of coal to create only one solar panel?
That's so much that it seems crazy to me, but I might be wrong. A few Google's searches didn't yield any interesting/satisfying answers.
They do give some sources in the script, but not about the main question I'm interested about.
In the other hand, they do give a source for the first statement (that is: Paul Roberts, "The End of Oil: On the Edge of a Perilous New World" (2004) p. 191) but I don't know what it is worth.
Part of the script concerned is here: http://www.incubatepictures.com/notomorrow/script_2_energy.shtml
You can see the part of the video I'm mentioning here: https://www.youtube.com/watch?v=VOMWzjrRiBg#t=880