When you were younger, you cared about the whole world, and at some point, somebody said you had to pick an issue, you had to boil your love down to an issue. "Can't love the whole world — you've got to work on trees or you've got to work on immigration.
Cuando eran jóvenes se preocupaban por el mundo y en algún momento alguien les dijo que debían elegir un problema y limitarse a ese.