Smokey the Bear celebrated his 65th birthday this year. Why has the message of the forest service that “only you can prevent forest fires” changed in recent years to allow more fires?

Answer 1

Do you do any research? It took me five minutes on google to figure out what the new term means:
http://en.wikipedia.org/wiki/Wildfire

Answer 2

Read carefully and take good notes.

http://whyfiles.org/018forest_fire/ecolog.html

http://www.enviroliteracy.org/article.php/46.html
Read all, and pay attention to the 4th paragraph.