if we are going to make the world cleaner, we could start by cleaning up the sidewalks? then we could maybe get to the part about fixing the hole in the ozone layer. >> i don't think it can be either or,very day. speak one way or the cities with the most open and aggressive commitment to the environment the dirtiest? why is portland, oregon, a filthy place downtown? >> that's not true. i'm not talking specifically about portland, but not all cities that are saying that we need to do better about our environment are filthy. we are you getting that from? >> tucker: okay. track with me ruick just for this one question. if you say you care about the environment, do you agree or disagree that maybe you should start by cleaning up the street in front of your house? >> why can't you do both? do both. >> tucker: i'm not saying that you can't do both. but wh is it that the people