Sectoral Emission Mitigation Potentials

Comparing Bottom-Up and Top-Down Approaches

Published: 05/03/2008

An important question for climate policy making is how much GHG emissions and energy can be saved, in which sectors and at what costs? Traditionally, studies looking at this question are often characterised as either using a Bottom-Up or a Top-Down approach. The differences between these approaches are far from clear-cut. The first approach tends to focus more on available technologies and their characteristics, while the second approach
focuses on the processes within the economy as a whole on the basis of observed historic behaviour. This report gives a detailed assessment over the two approaches.