Recycling is is undoubtedly increasingly important these days. However I wouldn't worry too much about recycling guidebooks. If you buy the SMC guide for Torridon for example https://www.smc.org.uk/publications/climbing/northern-highlands-south then you are supporting the production of future guidebooks, plus any profits go to the Scottish Mountaineering Trust which gives grants to worthy mountaineering related projects - footpath maintenance, mountain rescue, etc.
