I went to the website, where they have plenty of room to give long answers to the first objection; I found nothing! The pledge is very vague, and I already meet its requirements (so I signed it). Given that Peter Singer seems to be behind this, I'm rather disappointed, actually; I respect him as a philosopher.

•I agree that Singer has given insufficient attention to the question of effectiveness. In the past he has greatly underestimated the cost of saving a life and paid little attention to the question of whether international aid charities do what they claim to do.

•To be fair to Singer, his most recent book does give information about the effectiveness of international aid.

•The first three links under my response to byrnema and the links therein provide good discussions of the track record of international aid and what effect the best health interventions can reasonably be expected to have.