Some Southern Nevada elected officials are calling for tax increases, saying cities and counties can’t provide essential services without them.They voiced the concerns Friday in Carson City at the Local Government Summit, which attracted about 60 city council and county commission members from across the state, the Las Vegas Review-Journal reported.Among those who said tax increases are essential for local governments are Clark County Commissioner Tom Collins and Las Vegas Councilman Bob Coffin.They said Nevada cities and counties are operating on much less property tax revenues than before the recession, and adequate services can’t be provided without the ability to …