Metrolink tries new ways to reduce pedestrian and car collisions. In a 9-0 ruling from the Supreme Court has made it harder for local governments to impose certain fees -- and a little easier for a builder to sue over such fees. South Los Angeles and Orange County are the biggest emitters of a lesser-known green house gas according to a new study. Support The L.A. Report by donating at LAist.com/join and by visiting https://laist.com.   Support the show: https://laist.com