Published September 5, 2012 12:00AM

Snowboarders and skiers.
CONFLICT: Hang Gliders vs. Paragliders
EPOCH: 1980–1990
RESOLUTION: Safer wings make paragliding explode in popularity.
CONFLICT: Snowboarders vs. Skiers
EPOCH: 1999–2006
RESOLUTION: The advent of park and pipe makes skiing cool again.
CONFLICT: Skateboarders vs. Rollerbladers
EPOCH: 1993–1999
RESOLUTION: Rollerblading dies an ignoble death.
CONFLICT: Windsurfers vs. Kitesurfers
EPOCH: 2000–2011
RESOLUTION: The Olympic committee nixes windsurfing for kitesurfing for the 2016 Games.