Readers of USA Today can be forgiven for asking, “What’s all the fuss about that Keystone pipeline?” They must have read a column in the newspaper from Merrill Matthews of the Institute for Policy Innovation. It explains why the political debate about Keystone has little to do with the facts on the (or in the) ground.

The biggest mystery about the Keystone XL pipeline is why its final stage hasn’t already been approved by the Obama administration.

There are six things most people don’t know that make the mystery deeper:

From following the contentious Keystone pipeline debate, you can be forgiven if you think that the fight is over whether to build it. That’s not quite right. The Keystone system has already been transporting oil sands from Canada to U.S. refineries in the Midwest for three years — with no major leaks. The Keystone XL project that has received so much attention is the last phase of a larger project. Phase 1 has been operating since 2010, carrying oil from Alberta across three Canadian provinces and six states to refineries in Illinois. Phase 2 expanded the system from Steele City, Neb., to Cushing, Okla., a major U.S. oil refining and storing hub. It went operational two years ago, again with no major problems. Phase 3, under construction, extends the pipeline from Oklahoma to the Gulf Coast refineries in Texas. President Obama even gave a speech in Cushing in March 2012 — during his re-election bid — praising the pipeline extension as good for the economy. Phase 4, the Keystone XL, would build another extension to the pipeline system from Alberta, crossing only three states (Montana, South Dakota then Nebraska).

The new pipeline will disturb less land than the pipeline that has already been built. While the Keystone XL will have the capacity to deliver more oil — 830,000 barrels a day vs. 590,000 for Phase 1 — its U.S. footprint is more than 200 miles shorter than Phase 1.

After outlining four more little-known facts about the pipeline, Matthews adds:

The fact is that the Keystone XL pipeline is simply an extension of an already existing program that is working well, creating jobs and expanding U.S. manufacturing. It should be an easy decision for anyone concerned about the economy.