FALMOUTH — Maine’s chapter of the Sierra Club will discuss the difference between tar sands oil and conventional oil, and the potential risks involved with its transportation, on Sept. 11 at 7 p.m. at Falmouth Memorial Library.

The discussion will be led by Maine Sierra Club President Glen Brand of Falmouth.

“This is an issue that both has national but also extremely local connections and Falmouth in particular,” Brand said. “Cumberland, Yarmouth and Freeport (also) have a real investment in protecting not only our drinking water source in Sebago Lake, but also Casco Bay.”

He said Maine environmentalists are concerned that Enbridge Corp., a Canadian gas and oil company, hopes to pump tar sands oil from Alberta through an existing pipeline and into South Portland.

“The prospect of a tar sands oil spill into Casco Bay or Sebago Lake would really have catastrophic economic and environmental consequences,” Brand said.

A question-and-answer period will follow the 30-minute presentation.

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