While I agree with Hans to a degree, there remains an important link between population growth and climate change. In particular, WHERE will that population growth occur? 50% of green house gases can be attributed to three things (in almost equal parts): transportation, deforestation, and building energy consumption. Unfortunately, the building-design community’s vision of sustainability is myopically focused on increasing the energy efficiency and reducing the embodied carbon of individual buildings. So-called “green” buildings are simply not sustainable if, for example: