We continue to breed and expand without care for the future. At least in 3rd World countries. The problem for other nations is falling birth rates. See the photos and read explanations @ http://www.buzzfeed.com/kellyoakes/animals-in-decline#49u6rl5
Only one of those lives in North America for most of it's life. Also, harbor seals are far from endangered. They are listed by the IUCN as "Least concern"