This rich ecological diversity has benefited from a relative lack of pollution during the history of human habitation around the gulf , but environmental groups fear that the lack of a coordinated effort to control pollution may jeopardize the gulf 's ecosphere .
This rich ecological diversity has benefited from a relative lack of pollution during the history of human habitation around the gulf . 
 However , environmental groups fear that the lack of a coordinated effort to control pollution may jeopardize the gulf 's ecosphere .