Sport climbing
While it may arguably be more dangerous than sport climbing, traditional climbing leaves little or no trace of climbing, which preserves the natural environment of the cliff face (though many significant first ascents in the U.S. were done with a combination of permanent anchors or bolts and crack-fitting hardware were termed "traditional" when the term was first coined—see climbing styles). Sport climbing, on the other hand, requires bolts to be permanently drilled into the rock face providing the exclusive or primary means of protection. The difference between sport and traditional or "trad" styles has caused some periodic contention in the rock climbing community as the respective camps debate the merits of the differing styles.