Wilkins ice shelf breaking away?

gaia will sort it's self out
it is a dynamic equilibrium
this change will lead to other changes which will bring things back into balance

don't forget we had ice 1km deep over birmingham as recently as 10,000 years ago nobody complained then

I've never met an 'environmentalist' who is worried about the fate of the planet itself - I think all are intelligent enough to know that life will go on for millions of years after humans are gone.
It's often one of those arguments used by 'green-sceptics' to belittle and patronise 'environmentalists' by implying that their views are somehow naive and childish, ironically enough usually reflecting a lack of knowledge on their part in the first place.
What people *are worried *about is that the planet will become uninhabitable for humans and all the life-forms we are familiar with, which for some people is a valid worry, and for some it's not.

What the detachment of the ice-shelves show, and what they emphasise, is that climatic change can happen much more quickly than geological events.
Previous ice-ages have always begun very very gradually, but have ended incredibly rapidly in geological terms (i.e. 100's of years, not 1000's) (read about Dansgaard-Oeschger events)and the current period is proving to have a warming rate far faster than any other historic warming period studied.
So this event and other similar occurences are understandably worrying for those people who are worried about the fate of the next few generations of humans and other life-forms.