Before revision:  We use data covering almost all US patents as well as scientific articles published in the past two centuries to quantify the history of LCETs and their dependence on science. We show how the drivers of low-carbon innovations shifted from Hydro and Wind energy  to Nuclear fission  , and more recently to Solar PV and back to Wind.
After revision:  We use data covering almost all US patents as well as scientific articles published in the past two centuries , we describe the evolution of knowledge bases of ten key LCETs and show how technological interdependencies have changed over time. The composition of low-carbon innovations shifted from Hydro and Wind energy to Nuclear fission , and more recently to Solar PV and back to Wind.