For the large fund companies, the newly flared love of the climate among more and more investors is one thing above all: huge business.
With a manageable effort, often just sorting out individual values, conventional funds can be turned into sustainability funds.
The big shift from one vehicle to the other naturally brings them brilliant commissions.
If you look at the largest positions in the broad-based ESG funds, you will usually find the same names over and over again, sometimes with slightly different weightings.
Apple, Microsoft, Amazon and the other tech companies also dominate the picture here.
Anyone who invests in this ETF does not necessarily invest their money in the greatest pioneers in climate protection, but rather in large companies that are not obviously in the way of climate protection.
From an investor's point of view, that's not bad.
In terms of returns, the sustainability ETFs remain so competitive and a look at the carbon intensity shows that the ESG filters can weed out a whole range of climate offenders from the output index.
To what extent such investments help the climate is another matter.
Above all, companies that currently have poor climate values urgently need money to make their business more environmentally friendly.
Such investments would be much more risky for investors.