Nature vs. Nurture

The following link found by my friend points out the importance of parenting skills in the crane's survival:

http://www.chicagotribune.com/news/nationworld/ct-whooping-crane-migration-20160124-story.html

Can nurture overpower nature in just 15 years?  

What about the effect of inbreeding?

What about environmental factors like contaminated food, soil, water, and air, GMO, magnetic disturbance, and climate change?  It's not only the crane that is dying off.