The baseline architecture for energy transition is typically considered as replacing the internal combustion engine with battery EVs, replacing coal and natural gas with renewable power generation, and using renewable power for building and industrial heat. In this presentation, we explore the quantity of key materials required to construct the baseline architecture and compare that to known reserves and production capacity to assess its constructability. An alternate architecture is proposed consisting of carbon capture and storage (CCUS) with blue hydrogen. An assessment of CO2 storage, capture, and pipeline requirements is performed along with an assessment of hydrogen production and key metal requirements. CCUS and hydrogen are shown to have constraints but remain a proven, safe, and constructible energy transition architecture.