I am bitter and angry because people don't hug trees nearly as much as they should. Trees are lonely and sensitive, and despite their tough exterior they have feelings just like you and me. If you hug one you will sense that it has been taken for granted. It will tell you that it stands in the same place every day pumping out oxygen that we subsequently inhale at an obscene rate. This does not make them happy. In fact, it makes them bitter and angry, which, in turn, makes me bitter and angry when I hug them.