An aging 1/3  BIS central bankers' speeches  population is disinflationary, as precautionary savings will rise while the propensity to consume will drop. The green transition, however, will drive prices up. Then, what is green transition? It is defined as a shift to a low-carbon way of production and living.
To put it simply, green transition encourages more use of clean energy, and less fossil fuel, a major source of carbon emission. However, under current technological conditions, clean energy is more expensive and less stable than fossil fuels. That is why the green premium came into being. Right now, the cost of fossil carbon emission is almost non-existent.