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" ... The second is a rather more economic idea. Which is that capital, both mechanical and human, has become very much more specialised in the past century. Sure, there was a time when all you needed to build a canal was 20,000 men, some shovels and enough money to keep them going until the end. And once you'd done that a it more money and you could go build a road, a dam or a railroad. This simply isn't true any more. You need very specific equipment and very specific knowledge to do any of those things today. The same is true of building windmills, solar cells or drilling for oil. The expertise for one is not substituitable for the expertise for another. This idea that the oil companies should just go off and do something for which they have no talent, no knowledge and no skill is up to a century out of date. ... "