I couldn't find anything about this in English.
But summarizing it, the article says that during the pandemic lockdowns in Santiago de Compostela, there was a chance to study pavement temperature. It was discovered that in places where the grass and moss was not removed, the temperature was up to 20 degrees lower than in places where it was.
More moss and grass make our physical spaces more liveable in these times of #ClimateCrisis.