I saw something the other day - the numbers aren't exactly right, but it was along the lines of there's the same amount of energy in a barrel of oil as one man

I saw something the other day - the numbers aren't exactly right, but it was along the lines of there's the same amount of energy in a barrel of oil as one man working full time in a manual job FOR SEVEN YEARS. This is why we've (unfortunately) built modern societies on fossil fuels. The amount of work done as a result of it is immense, and probably explains why there aren't vast numbers of people enslaved for manual labour any more.