He's saying build solutions, not just stuff, is he? So, you could build an environmentally sound solution to replace a polluting incumbent.
Anything you built has inputs, outputs and waste (this is the bad stuff that makes our lives worse and is subject to the problem of the commons) - it isn't an efficient process. Often benefit accrues to the person with money, and the waste goes to everyone else. Sure there are some nice solutions out there but on the whole we probably need less building than done today; and what we do build being much more targeted to society's benefit.
As an example I look at China and think - they build a lot of stuff but I wouldn't want to live there personally with the smog, pollution, bad environment, etc. I live in a nice part of the world but can see "progress" coming close to my door. Maybe I'm just getting cynical.