This suggests that frictional unemployment may have declined and the labour market has become more efficient at matching workers and jobs. It isn't hard to imagine that the shift to online job advertising has had something to do with this. So there's one reason why the NAIRU might be lower nowadays.
At first glance, the amounts lent by German institutions to sectors emitting especially high levels of CO2 appear insignificant: loans of € million or more granted by German banks to coal mining companies currently amount to no more than just under € billion in total.