But stopping or severely cutting back on offshore drilling actually has a worsening effect on the environment. World tabulations of sources of oil pollution in the ocean show that oil contamination from natural seeps constitutes the largest source (46%). The second largest comes from operational discharges from ships and land-based industrial sources (37%), then 12% comes from spills from shipping of oil, and finally only 3% from offshore drilling operations, (see http://oils.gpa.unep.org/facts/sources.htm).
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