I don't understand why it should suggest that do you really think I don't know about the existence of tools / spear heads / swords / blades before fossil fuel industry?!?! Mentioning the iron age myself excludes your argument I would suggest we only got iron and steel after we had fossil fuel industry (except you presume I would not know iron age was far before industrial revolution)... The difficulty of the history of iron is to separate meteoric iron from reduced iron, but that's all. Nobody ever would get the idea we only had iron / steel after fossile fuel industry... I posted did / do in one sentence because it does not matter when (historically) you have a look at it... Iron / steel IS and WAS material to build factories and infrastructure such as railways...means has to be there before you can build them. "steel / iron to build factory / industry" This bit already determines that iron / steel is precondition for the existence of factory / industry. When somebody does not express oneself clearly (like I seemly did) then you should anyway have a look which suggestions can be valid at all. As said...we are actuality not much different here (content) but structure of expression / conclusions... The history of iron / steel is familiar to me...also its obtaining.