This 50% will be the target amount to be never explored or used. Out of the remaining 50%, there will be a possible 2% that will have economic resources and the rest of that 50% would have not much happening but sustainable logging. The North has not much useable land to start with, most not needing any saving, as its not going to be wanted anyway except for hunting and fishing as over the last thousand years. Take a flight over the north sometime