NAGOYA — As Japan pledged $2 billion Wednesday to preserve biodiversity in the developing world, negotiators at COP10 reported progress toward concluding an international agreement on access to genetic resources and establishing biodiversity preservation targets over the next decade.

But questions over whether to include derivatives of genetic resources and human pathogens in the final agreement, and financing of whatever preservation targets are agreed upon, continue to divide delegates.

Indigenous peoples' groups, angry that COP10 delegates stripped the draft text of language that would offer strong protection of their land rights, began leaving the conference Wednesday, vowing to fight their countries' ratification of whatever comes out of Nagoya.