“The 2002 report also made estimates for
North America, where offshore oil and gas development
was found to be responsible for only 2 percent of the
petroleum inputs in North Americas marine environment.
In the 2002 NRC report**, natural seepage was the largest single source of petroleum in the worldwide marine environment, contributing over 4 MMbbl/yr, 47-percent of total inputs. In North America, natural seepage is the
largest input, contributing 63 percent of total inputs to the marine environment. Municipal and industrial waste is responsible for 12 percent of worldwide petroleum inputs
and 22 percent of petroleum inputs in North American
marine waters. Marine transportation is responsible for
33 percent of worldwide petroleum inputs and only
3 percent of inputs in North American marine waters.”
ping
Some excellent data.