This kind of major undertaking is admirable, because it will reduce suffer and pain to the people who are not so fortunate.<p>The charity contribution I offer is limited and do the best I can through organizations like Kiva.org. I just wish that other well known and well off tech leaders e.g. Larry Ellison, Steve Jobs  would be more active. 
Maybe the Gates Foundation with their actions encourages them to do something on a bigger scale.