The Pacific Yew can be cut down and processed to produce a potent chemical, taxol, which offers some promise of curing certain forms of lung, breast and ovarian cancer in patients who would otherwise quickly die... It seems an easy choice - sacrifice the tree for a human life - until one learns that three trees must be destroyed for each patient treated.
Earth in the Balance: Forging a New Common Purpose (ed. Routledge, 2013) - ISBN: 9781134038381