An ambitious effort to boost the number and size of trees in the city of San Diego faces a difficult timetable. The city’s climate action plan hopes to soften the impact of climate change by tripling the city’s tree canopy. Plus, the San Diego County Medical Examiner has determined the cause of death for a San Diego State student who died after attending a fraternity party. The university has now formed a task force on student activities and safety and another on alcohol and substance misuse. Also ahead, the Supreme Court justices heard arguments Tuesday from the Trump administration on why it should be allowed to cancel DACA. Hear what's at stake locally for young immigrants.