Hi Neal,
I think the adwords trend graph shows clearly the figures on this term are erroneous -appearing from nowhere in the depths of winter, local search results 4 times that of global, and very little advertiser competition on the term.
I think the question is, if you were searching for information on mountaineering, would you type in 'climbing mountaineering' when 'climbing' or 'mountaineering' on their own would suffice ?
If not, it's unlikely hoards of others would.
Others on here may see things differently to me though, so good luck with it.
Steve.
Ps. Never trust the adwords tool on it's own. Quite often there are problems, it seems..