What do you mean by important? Birds are more important to me than Saddam Hussein, inasmuch as I can't think of a single species I would extinct for his sake. As a rhetorical question, I would probably see all the birds dead before my daughter, but that makes no sense without a context (unimaginable to me at the moment) where there was a clear-cut choice between all the birds and my daughter's life. So, as stated, the question just doesn't mean anything to me.
Want some concrete questions, then? How about these:
Is the possible risk to birds and "ecosystems" from DDT more important than saving MILLIONS OF HUMAN LIVES by allowing people to use it to control malaria?
Yes or no?
Should the bans on DDT be lifted?
Yes or no?
I do not have sufficient information to make that determination. My advice to people in malaria-infested areas is to migrate out of those areas, at least until a solution may be found and applied. Who is forcing these people to live in these disease-infested areas and why does that constitute an obligation on my part?
Here in CA, we have no DDT use, yet we manage to control insects and have one of the most productive agricultural industries on the planet. Why can't alternative means be found in the areas you are concerned with?
You seem to want to use DDT more for political reasons than scientific ones.
BTW, who is going to feed these millions you want to save? US foreign aid? How will they find work? Is it possible that overpopulation or other factors are driving humans to try and live in areas where they simply shouldn't be? Are we prepared to deal with Ebola-like diseases that are airborne, which may very well result from pushing human development into previously-uninhabited areas? Wouldn't spending all that money on finding a vaccine for malaria be more effective, since DDT resistant strains of mosquitoes are bound to develop?
I have to say that I value life and do not make this huge, Chinese wall division between human life and all other life. Humans are wonderful, as are birds, fish, and the complex web of interrelated species necessary to sustain them. If we knew enough to be able to say "dousing this region with toxin A will save N human lives, but will extinct species B, C and D", then we could make some informed choices, like creating captive breeding populations of the at-risk species, applying the toxin to wipe out the threat to humans, then repopulating the area from the captive population. Such an approach might be a way to serve all stakeholders.
How many human lives is one species worth? Well, as a human, I can't really say in a general sense. I guess the passionate species-chauvinist would say that no non-human species is worth a single human life, but I do not agree. OTOH, as a human, it depends on the life in question. Trade the life of my daughter for all the golden finches? No problemo -- bye, bye birdie. Trade the golden finches for the bottom-line of Dow Chemical or Monsanto? No way, Jose!
RS