Running such wild rivers as the crocodile-infested Tekaze in Ethiopia, Richard Bangs used to lived for the adrenalin, for the rush of reveling in the misery of hardship and sidestepping death around every bend. Now a respected conservationist, he still travels to demanding exotic environments, but with a new, more sober objective: he wants to save these special places. Bangs' personal experiences of "witnessing many special places preserved and lost"...