I was walking in central London and something felt wrong. I couldn't quite tell what though, but I had this constant feeling of unease.
It took me a few days to understand - there are no trees in central London (the City).
Sure, you have a small/big park here and there, but no random trees on side walks. It's literally a (beautiful) concrete/glass wasteland.
Note: I only walked a few of the main streets, I'm sure I'm exaggerating a bit, but it's quite noticeable compared with other cities after you realize it. And there are random trees in other areas, outside City of London.
Maybe we're both right and wrong at the same time.
Here's a map of the canopy data.
Different countries / geographies have these very different relationship with nature. I remember coming back from small islands in the caribeans, and there nature is overwhelming, the size and density. Just after landing home (france) I felt suddenly naked from the lack of vegetation, there were trees but one every 400m on large avenues. It felt empty.
Agreed when it comes to the City of London (for anyone not familiar, this means the financial centre). It can feel pretty grim walking there at times.
Elsewhere though, possible to plan continuous walks through greenish spaces. One starting at Victoria: Belgravia back streets, Hyde Park, Grosvenor Square, Marylebone High Street, Regents Park, Primrose Hill, Belsize Park, Hampstead Heath.
The City is not central London, horrible place, dead at the weekend. (Shudder)
On the other hand, when I visit Venice - which is as tight a city as can be, small streets with stone in every direction except the sky - they somehow manage to drop trees in stone squares.
Same shock, different direction, much nicer.
What? London is one of the greenest cities in the world.
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I'm not sure what parts of London you were in, but there's many trees in London on sidewalks. There's even a specific species for it - the London plane (Platanus × hispanica)
If you're in the very new, constantly rebuilt, concrete jungle that is the very small part of the city, then OK, greenery is going to be hard to spot. Particularly as they tend to nearly always choose the wrong species to plant and aftercare is an afterthought. But your assessment is factually incorrect.
See for yourself. Go to Google maps, drop a good few street view randomly around the city and you'll see that more often than not you'll see trees.
Also, I have a networks in arboriculture who work in the city and they're never short on work.
I'm not doubting your experience of unease or a concrete/glass wasteland (that's yours and not mine to question) but the facts don't support the statement of no random trees on pavements (side walks).
I live in the North, but I'm often in London.