In recent years, a few managers of lake systems have conducted studies on PWC impacts, and found the vehicles to be prominent contributors to water pollution and air pollution;
(a few managers of lake systems; have conducted; studies; T:In recent years) (a few managers of lake systems; found; the vehicles to be prominent contributors to water pollution and air pollution; T:In recent years) Context(a few managers of lake systems found,List([17, 96))):(the vehicles; to be; prominent contributors to water pollution and air pollution)
a few managers of lake systems found,List([17, 96))
a few managers of lake systems a few managers of lake systems the vehicles
have conducted found to be
studies T:In recent years
the vehicles to be prominent contributors to water pollution and air pollution T:In recent years
prominent contributors to water pollution and air pollution