and 'climate change denial'. The suggestions about what might happen to North Atlantic circulation with increased Greenland melting are very varied - here's what RealClimate had to say, last year:
Nature this week has an excellent summary of the state of the science with regards to possible changes in the ocean thermohaline (or meridional) circulation in the Atlantic and its impact on climate. Even though it quotes a couple of us, it's still worth reading if you want to understand how results like the Bryden et al paper - that suggested that the Atlantic overturning had reduced by 30% in recent decades - are assimilated into the scientific picture.
...
Everyone quoted is however agreed on one thing: "the notion that (a future change in the themohaline circulation) may trigger a mini ice age is a myth”. The evidence of previous changes for instance at the Younger Dryas or during the 8.2 kyr event is quite strong, and significant coolings were observed particular around the North Atlantic, but even such localised coolings are not predicted to occur if the circulation slows as an effect of global warming.
It is however a complicated business, and the stability of this circulation depends on many aspects of climate that are poorly observed and uncertainly modelled. So it may yet be some time before new observations (such as the permanant monitoring array recently installed along a section of the ocean), better modelling, and a better appreciation of the paleo-climatic data add up to a coherent understanding of this interestingly counter-intuitive aspect of climate change.
http://www.realclimate.org/index.php?p=187