I opened up Google Street for Valencia (claimed to be the worst in the article) and I struggle to find a street that plausibly fails this test.

Half dozen trees directly outside my window, but London Ontario is "the forest city" with an initiative to get 27% tree canopy to 34% by 2065

From one window? From all windows? And how far from the window they should be visible, and how far can you look? Can you stick your head out? Can we cheat by planting a few very tall trees that can be seen from very far away? :)