Sentence:  In addition to urging greater restrictions on aerial spraying , Buchheister called for support of the Wilderness bill , creation of national seashore parks , including Point Reyes ; preservation of the wetlands where birds breed ; a pesticides co-ordination act ; stronger water pollution control programs , and Federal ratification of an international convention to <WSD>halt</WSD> pollution of the sea by oil . 
Meaning of the word marked with <WSD> tags:  stop from happening or developing