text:  What trees really can do is they help us by doing something called evapotranspiration. Basically, they actually take up that water and they put it back, and that offers not only shade but also a cooling effect, and you feel it quite noticeably. And honestly, I think the best way to do this is on the next hot summer day, stand in the middle of a parking lot, completely pavement covered, and then go and stand on a tree-lined street. And what you're going to feel...