Independent: On the way to work tomorrow, as you hurry, head bowed, to the crowded bus-stop or station, or pause in the car at the red traffic light, feeling your blood pressure start to mount as you see that, on the other side of the junction, the traffic still isn’t moving, do yourself a massive favour: look up. What may swim into your line of sight is greenery. We’ve been without it for five months, do you realise? And now it’s back. Those things called trees, those tall roadside posts that for …