Is love of nature in the US becoming love of electronic media? 16-year downtrend in national park visits explained by watching movies, playing video games, internet use, and oil prices.
J Environ Manage. 2006 Sep;80(4):387-93. doi: 10.1016/j.jenvman.2006.02.001. Epub 2006 Mar 30. J Environ Manage. 2006. PMID: 16580127