The green fever is rampant in the financial market.

This is not a new finding, but the temperature is rising.

This shows the high demand for the first green EU bond on Tuesday.

Investors are enthusiastic when they can serve ecological and sustainable goals.

But the green fever harbors the risk of overheating.

As important as enthusiasm for sustainable investment products is, it also increases the likelihood of price exaggerations and neglect of risks.

This is particularly true of sustainable investments because there is still no consensus about which products should be used to save the world.

Opinions differ on sustainability, as the dispute over nuclear power in the EU shows.

Some issuers currently want to shine on the market with a green coating, even if there is not really any content that is used to protect the climate or the environment.

American and German supervisors are still examining whether this so-called greenwashing of the Deutsche Bank fund company, DWS, can be accused.

But the share price slump shows how doubts about the green face can weaken confidence in financial institutions.

It would be advisable to think about the transparency and traceability of green products, instead of just worrying about how the green advertising drum can be stirred even faster.