This paper illustrates how the usage of long-short strategies can contribute to reducing or even reach carbon neutral or negative footprint of an investment portfolio. The amount of leverage applied to such strategies will be crucial for the total impact. In the empirical section, we show how this could be feasibly applied in a credit derivative context, that should be suitable in particular for real-money investors that are able to use gross if not net-leverage on their core portfolios.
We believe a broader point of the paper is how it demonstrates the principle that the investments investors make in terms of “green” or less carbon-intensive assets on the long side are highly dependent on what they divested from or shorted on the other side to fund that investment. An investor buying a mediocre green bond can consider that investment as ’green-er’ if it is paired with shorting a high-fossil asset on the other side, whereas the investor shifting from a low-carbon benchmark into that mediocre green bond provides very little additionality from an investment impact perspective.