It is often said that investing with one eye on sustainability will automatically reduce returns, even though there is a growing body of evidence that this is no longer true.

The latest proof that this is an outdated view comes from the release of the latest Clean 200 ranking, a list of the 200 largest publicly traded companies in the world making significant revenue from clean energy. In the first full year and a half of live performance, to September 2017, Clean 200 companies generated a total return of 32.1%, almost double the 15.7% for its fossil fuel benchmark the S&P 1200 Global Energy Index.