Trees can also help reduce the amount of noise inthe surroundings, although the effect is not as largeas people like to think.Low frequency noise, inparticular, just goes through the trees as thoughthey aren't there.Although trees can significantlyimprove the local climate, they do however take up alot of space.There are root systems to consider andbranches blocking windows and so on.It maytherefore be difficult to fit trees into the locallandscape.There is not a great deal you can do ifyou have what we call a street canyon - a whole setof high-rises enclosed in a narrow street.Trees needwater to grow. They also need some sunlight to grow and you need room to put them.If youhave the chance of knocking buildings down and replacing them, then suddenly you can startlooking at different ways to design the streets and to introduce ...