It's easy to tangle up ideas, especially when we approach an issue from a narrow perspective. That seems to be the case with the newly published report by the Breakthrough Institute. Their topic? The "rebound effect." Their target? Greater levels of energy efficiency. Their conclusion? The rebound effect will negate most of the energy and emissions gains we might see from more productive investments in energy efficiency. Many in business and policy communities increasingly see energy efficiency as a smart, no-regrets investment opportunity for the U.S. Just one example? It turns out that our current system of generating and delivering …