"Actually the mass dying off of krill in the oceans is directly related to the ozone layer holes over the poles."

The ozone depletions is due to chlorofluorocarbon (CFC) pollution mostly, which is not related to global warming.

There's actually a lot to debate without falling into fallacies and unsubstantiated links... That's what's always been my pet peeve with environmentalists like Greenpeace, in their zeal about the issues they confound the information (they do the same when it comes to transgenic organisms).

I'll grant you that the other things you mention are related to global warming.

Please note that when I say something is uncertain or unrelated I don't say that means we shouldn't act on it, as many politicians prefer to do.
My position is that if we're not sure we should act anyway, because later it may be too late and because stopping one of the potential causes is an experiment that may help to find out their effect.
Since the CFC ban the ozone layer has shown some recovery I think, there's an example where the science behind wasn't accepted by everyone but by removing the cause we did well and showed the relationship.
I think that reducing carbon dioxide emmissions should be done too.