Well, relax and remember that the earth will recover. Its history is dotted by global catastrophes..."snowball Earth," the Permian/Triassic mass extinction, K/T impact, Paleocene/Eocene thermal max... Given that recovery time is often measured in millions of years, life will continue even if we do our worst.
Now, given that, the reason many folks don't care is they just think we're talking about some kelp going extinct and not us!
Bleh! Shark liver is in my top ten most disgusting smells list!
I wonder of google could be convinced not to accept ads for snake-oil products that cause horrible environmental consequences?
edit: I gave "ad feedback" to google, and pointed out that these ads may violate the adwords policy against "miracle cures." I referred to this thread as an example of reactions we have to these ads, so if google folks are reading this, a summary of the issue can be found at http://en.wikipedia.org/wiki/Shark_cartilage (and the related link about shark fin soup has more details about the absurdity of shark fishing practices for gourmet and alternative/quack medical claims)
I tend to not worry too much about things like this. Global climate change has been around for ages - and at the end of the day, its probably gonna happen/is happening and no-one's gonna stop it.
The thing is its a gradual process - if the sea leval rises - people will move.
It sucks about the more unstable weather though, lots of problems with that.
We have the luxury to be able to worry, because if I was in the amazon and chopping down trees to make a living, a small shift in global temperatures probably wouldnt make much of a deterrant.
So don't feel too depressed, if were all going to hell in a handbasket :