I don't think they called for primitivism. For example, the glut of roads is from a car-centric, unplanned form of industrialized economy where capital is the only thing in control, not people planning for human need. "Traffic engineering", for example, is a lagging workaround for economic "plannin" that is just the anarchy of the market, of making it cheaper for companies to acquire workers by connecting residential to commercial and industrial, with all the latter 3 being created by a flurry of capitalists for their own ends.

It is true that planning and development is what is needed instead of capital-based anarchy, however. Addressing CO2 production requires first investing heavily in energy-intensive production, releasing even more CO2, but then being able to overalll decrease it via cleaner energy production, less need for travel, cleaner transit, less need to produce pointless commodities, etc.