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Why should it now be the fault of "greenhouse" gases?
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The difference is the speed with which human activity can alter the balance of gases and ice and water around the Earth. This leads to those natural processes happening considerably faster than they occur naturally, in human timescales (tens of years) rather than geological ones (thousands of years). It's this speed difference that is the difference between climate change predictions and the science of historical temperature fluctuations.
Against that, we've only been able to monitor sea ice for under 30 years - having a satellite up there about 800 years ago might have been interesting.
Remember that melting the Arctic doesn't do that much harm (sea levels stay the same, polar bears starve and Eskimos fall through the ice, but otherwise it's not too problematic) - it's the reduction in solar reflection and the consequence for land ice which is particularly dangerous.
My plan - add 5p to petrol and put the lot into research into solar energy - there are only two raw energy sources on Earth, solar and nuclear, and solar is much nicer
Come up with a GM bacteria that turns carbon dioxide and sunlight into diesel oil and the circle is closed.