Healthcare premiums have become one of the most contentious issues in labor negotiations for California teachers unions this year.Teachers say escalating costs are swallowing their raises, while district leaders say schools can’t shoulder the cost without having to cut elsewhere, especially as they grapple with declining enrollment, expiring federal aid and rising pension costs.Guests:Michelle Bird, teacher, Twin Rivers Unified School DistrictDiana Lambert, senior reporter, EdSourceRead more from EdSource: Soaring healthcare costs put California school districts and teachers at oddsEducation Beat is a weekly podcast hosted by EdSource’s Zaidee Stavely and produced by Coby McDonald.Subscribe: Apple, Spotify, SoundCloud, YouTube