No where in this article does it say the birds died because of global warming or warming oceans. It did say they were emaciated or starving. The shearwaters come from Australia where the water is always cold and has not warmed up? The author nor scientist said how much exactly the water warmed up. Nor did they say why warm water would effect the food these birds eat. Why were they starving? Was there no food or fish? Why not? Humans have used the oceans for many things including nuclear waste depositories. Humans also may be disrupting the food chain by removing untold sums of biomass yearly by commercial fishing.  

They suspect the bird die off it might be from toxic algae blooms but scientist have no proof as of yet. Is the toxic algae bloom killing the food chain or directly killing the birds or both. I can not tell from this article and the scientist have not claimed the whale die off 2 years ago was caused by algae blooms either.