Miami-Dade County Commission Chairman Joe Martinez is in disfavor with civic and environmental groups after booting Commissioner Katie Sorenson off the influential South Florida Regional Planning Council just days after she voted against efforts to move the county's urban development boundary. The boundary is designed, in part, to keep urban sprawl from encroaching on the Everglades. Sorenson's supporters, including Miami-Dade Mayor Carlos Alvarez, charge Martinez with bowing to political pressure from the county's powerful pro-development lobby.