This document summarizes a study that uses an economic model combining the Ramsey model, a logistic curve for technology diffusion, and learning-by-doing to investigate how varying parameters related to technological change and learning affect optimal CO2 emission reduction pathways. The model is run under scenarios of slow/fast technological change and low/high learning. Results show emission pathways are similar except under fast technological change and high learning, which supports deferring reduction. High learning and slow change favor earlier technology switching. Loss of GDP depends mainly on the learning rate.