Economic Development in Calgary, Alberta, Canada

We flew into the Calgary and were amazed at the amount of new housing that was being constructed along with new roads and highways.  New houses starting at $300K are directly related to the growth in the oil and natural gas industry.  Those in Maryland opposed to Marcellus Shale drilling may want to reassess their opposition.    I also read that Western Pennsylvania has the second greatest housing growth in the US second to only the greater DC area due to the increase in federal jobs.  Why and how in Western PA?  The rapid expansion of Marcellus Shale drilling.