When I was young silver Birch trees were greyish silver. I remember seeing some in our local park. Even when I came to live in this city they were silver grey…..

But now… Each time I see one its white?! Is that right, are they the same species? I think they are…. I think it indicates how much less industrial smoke is in the air? And are trees growing faster now? They seem to shoot up. If they were cut down would their tree rings be wider, fatter, more growth in a year than before the pollution started to reduce… Memories of a changing world.