NEW: Should the US increase imports of tar sand oil from Canada? – Before the end of 2011 the US State Department must decide whether or not to approve a 1,700 mile crude oil pipeline known as the Keystone XL pipeline which would span from Alberta, Canada to Houston, Texas. If approved, the pipeline would transport up to 830,000 barrels of oil per day. Debate currently rages over a variety of environmental and economic issues. Take a look at our newest question to view Pro and Con arguments from several prominent experts and organizations.