Thanks for the clarification.

Mmm. I'm going to have to disagree with you, I think. Yes, a few more trees may not seem to you to make much difference, but in a city like London they really are needed - each will help a little, and if each street got one more tree it would make a big difference to air quality, and indeed to the mental health of those people who enjoy seeing greenery (and yes, I am one of them).

Lewisham seems to me from what I've seen (and yes, anecdote does not equal data...) to be rather gung-ho about chopping down trees, and conversely reluctant to plant new ones. I feel sure that there can be a compromise between those who appreciate the value of trees in urban areas, and those who are worried their cars will get messy/their drains blocked/ their house foundations undermined.*

I think that I once read about a way of paying Lewisham for trees to be planted - even choosing what sort of trees.
Fancy pming me your address, so I can do some guerilla gardening? (only joking, obviously)



*notice my pleasing tricolon there.