After growing protests, world leaders sat down today for the first time to discuss health, debt and the poor - exactly the topics that demonstrators have complained are ignored by rich countries. But progress was incremental and unlikely to defuse the criticism that the wealthy nations worry about trade first, their own wealth second and everything else third. On the opening day of their summit meeting in Genoa, the leaders of the world's biggest economies announced that about $1.2 billion had been committed to a United Nations "Global Health Fund" that would primarily fight AIDS, following through on a commitment made at the summit meeting last year in Okinawa, Japan.