Reading the End of Food will demonstrate beyond a reasonable doubt just how much oil you consume, son. Check this link out. The whole fucking show is awesome (the whole fucking series is awesome) but this was one of the demonstrations that impressed me the most in my young life. Start at 2:32 if the link is fucked: And that, dear flagamuffin, is why the world doesn't run on sunlight. That energy goes into fertilizer, too.
I don't know which part you were talking about specifically, maybe the eye-opening bit with the teaspoons of gunpowder and petrol -- wow -- but I'm sure glad I accidentally watched the whole thing because at the end a well-meaning penciled British family drowns when their car isn't energy-efficient and they trigger instant global warming.