when within a century man is responsible for opening up those waterways again....purely as a side effect from his behaviour in other parts of the world?
LOL @ Boldie making stuff up.
LOL at disputing it...I am not saying the icecaps wouldn't have melted on it's own but is anyone still seriously disputing man's impact on this? Even Jeremy Clarkson and George Bush don't.
LOL for using Jeremy Clarkson and George Bush to try and back up your argument.

I
am disputing the "purely" man's behaviour part of your post .
I'm not disputing that we should be more respectful of our planet but everytime something happens to nature or the climate it's very fashionable to blame it on what
we are doing to the planet. Thus creating a whole industry of scaremongering, axe grinding "environmentalists" and a reason for Governments to Tax us while they arse lick the Companies who cause the real Environmental problems around the globe.
Volcanoes spew out more CO2 than humans do and they have just discovered loads of volcanoes under the Arctic, maybe that's what caused it? the Earth might be going through one of its "warm cycles" for all we know that is what is causing it.
Anyway if it cuts 4000 miles off a trip from Europe to Japan for container ships then just think of all the emissions that won't be pumped into the atmosphere if it stays melted.