Skewing asset purchases to green bonds, say, would run counter to this principle, which is anchored in Article 127 of the EU Treaty. And a trade-off could arise once monetary policy considerations call for applying the brakes and scaling back the bond purchases. In this situation, I dare say there would be calls to press ahead with the green asset purchase programme.
We have on our side what Larry Summers and Lant Pritchett have called “perhaps the single most robust and empirical relevant fact about cross-national growth rates”, which is that different countries revert to the same growth average over time. They 3  say that “… current growth has very little predictive power for future growth” .