By John Rossi
The U.S. State
Department recently produced a draft environmental impact statement which gives
a preliminary green light to the construction of a Canada-U.S. pipeline that
will complete the link of the tar sands of Alberta to America’s Gulf Coast
refineries and port facilities.
To understand the
environmental problems with the Keystone pipeline, we need to start with the
raw material and how it is produced. The Athabasca tar sands in Canada’s
Alberta province are the world’s largest and cover an area the equivalent of
Florida. These sands contain bitumen, a semi-sold form of petroleum, a
tarry-like substance, mixed with sand, clay, and water.
There are two major methods
to turn this product in to oil. During the late twentieth century the end
product was called “synthetic crude,” because of the huge amount of processing
involved.
The mined “ore” is
crushed and then very hot water is added to help transport it in slurry form to
a separator. There, more hot water and chemicals are used to remove the
petroleum. The resulting separator output is a mix of bitumen (60 percent),
water (30 percent) and solids–mostly sand and clay (10 percent) which must be
“cleaned” to remove the non-petroleum parts. Approximately 90 percent of the
bitumen is recovered through this process.
The wastewater is sent
to tailing lakes. The largest is about 31.5 square miles in size and is one of
the world’s biggest man-made structures. It too is visible from space.
In-situ is the other
method of bitumen extraction. It requires that wells be drilled through the
formation and then steam injected into the wells to melt the bitumen. The
resulting hot oil is pumped out. About 60 percent of the bitumen is recovered
in this process which is much less destructive than mining.
Whatever method is
used, all of this processing takes enormous amounts of energy; about 700 cubic
feet of natural gas are used to produce a barrel of oil from bitumen in mining
and about 1,200 cubic feet for a barrel of oil from the in situ process. In
total the amount of natural gas being used to extract bitumen from Alberta’s
tar sands is enough to heat about 3 million homes.
Dr. Marlo Raynolds,
senior advisor to the Pembina Institute, a Canadian environmental research
group that supports environmentally responsible development of the Alberta tar
sands observes the perverse logic of current tar sands extraction: "What
bugs me about oil sands is that it is a resource that is being inefficiently
used. We're using natural gas, which is the cleanest fossil fuel, to make a
dirtier fuel. It's like using caviar to make fake crabmeat."
Burning all this
natural gas means that producing a barrel of oil from bitumen, the Pembina
Institute notes, releases over twice as much air pollutants such as nitrogen
oxides and sulfur dioxide as extracting a barrel of conventional crude.
Greenhouse gas emissions from extraction are between 3.2 and 4.5 times greater
per barrel.
Simply put, extracted
oil from the Alberta tar sands is one of the most wasteful and environmentally
destructive methods of producing petroleum on the planet. And, this is not
counting greenhouse gas emissions.
The Keystone pipeline
allows an enormous expansion of tar sands oil extraction and vastly increases
the scale of environmental devastation. Americans will not allow this kind of
environmental ruination in our country and we should not import oil that
facilitates it in Canada.
This article also appeared in the Harrisburg Patriot-News Online on March 29, 2013
John Rossi is the
Climate Change Committee Co-Chair of the Pennsylvania Chapter of the Sierra
Club. He can be contacted at jpr2@psu.edu.
Take
Action on the Keystone XL Pipeline NOW!
Email the State Department at “keystonecomments@state.gov“.
The Department then, by law, has to respond to your written comment. Do
this before April 15!
- Send a copy of your comments in letter form to President Obama.
- AND COPY this letter to John Kerry, Secretary of State.
- AND send a copy to Senator Robert Casey:
- AND send it as a letter to the editor to your local
paper.
THANKS!
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