I have no doubt that a new human virus is of more danger than global warming, and for the record I'd like to add other things that are of more pressing concern than global warming: terrorism; cyber attacks; computer viruses; (even worse) global financial meltdown; everything really thanks to the 'global village' problem.
So I have my own way of determining the seriousness of any new threat to human life, it's called the Celebrity Death Test, and I hope you find it useful. The way it works is simple, if a Celebrity dies from the Threat then it is to be taken Seriously, if they don't then it's probably nothing to worry about. Bird 'Flu, fine. AIDS, not fine. I can remember when Rock Hudson died, that was the moment when AIDS became real for me. (I'm also a fan of Doris Day, read into that what you will!) You see how it works? It's just a statistics thing. If a Celeb suffers from it (and assuming it's not something that has a natural correlation with Celebrity or is self inflicted) then it is statistically significant for the rest of us.
BTW your intrepid reporter is due to lecture in Mexico City in a few weeks. All being well I shall give you news from the frontline, possibly from behind a face mask.