Arup - How can engineers talk like economists?

From the Arup blog by Simon Roberts - link.  I have been a strong advocate of a better blending of the minds of the engineer and economist.  I would go a step forward - portions of engineering need to talk and think like an economist.  From the post:

"I think that the data behind gross domestic product (GDP) figures can give engineers a way to engage effectively with economists. 

Don’t we do this already? I believe that we don’t – that engineers and economists lack a common framework in which to link up their contributions. And I think this is one reason the world lacks ambitious countrywide policies for low-carbon mitigation and sustainability that are plausible – ideas that will work in both engineering and economic terms."