In conducting operations, central banks should try to affect the overall macroeconomy while avoiding involvement in micro-level resource allocation as much as possible. However, when central banks provide funds by purchasing financial assets, either through conventional or unconventional monetary policies, they not only change the macro interest-rate level but also affect the relative prices of individual financial products.
Therefore, when considering the impact of central bank policies, I think that market neutrality needs to be interpreted with some latitude. When focusing on climate change issues, there is the question whether the neutrality of resource allocation is ensured simply by treating existing investment or loans equally.