Authorities have seized $1 billion worth of marijuana plants and have arrested 82 Mexican nationals with ties to drug cartels in the first week and half of an effort to eradicate marijuana fields from California’s Fresno County, the county sheriff’s office said Wednesday. Operation Save Our Sierra began July 13 and involves local, state and federal agencies working together to remove marijuana growing operations, investigate and arrest drug traffickers, and remove infrastructure on public lands in Fresno County, a news release said