In reply to icklebekx:
I wouldn't class most climbing as particularly "high risk" and it depends on the level you climb at.
What do you mean by "risk"? I suggest most people mean likelyhood of death.
If so
Bouldereing and top roping are very low risk
Indoor wall climbing is very low risk*
Sport climbing is low risk*
DWS is low risk
Trad well within your grade is low risk*
Pushing your grade on trad is medium risk*
Soloing is medium to high risk
Summer hill walking is low risk
Winter hill walking can be medium or even high risk depending on conditions
Snow and ice climbing can be medium to high risk*
Scrambling is low to medium risk
Alpine mountaineering can vary from low to high risk
Mountaineering in the High Ranges can vary from medium to high risk
* This assumes risk to a leader. Risk to a second is much less.