>The amount of ice on Greenland have seen significant variations over the last few hundred years
Yes, because of well known past climatic variations (some of which were probably localised). There are other drivers of climate than carbon emissions, and these drivers have caused climate to change in the past. That doesn't mean carbon emissions can't drive climate today. We can measure many of these other drivers, and we can see that changing solar output for example can't be driving the current warming.
Yes, because of well known past climatic variations (some of which were probably localised). There are other drivers of climate than carbon emissions, and these drivers have caused climate to change in the past. That doesn't mean carbon emissions can't drive climate today. We can measure many of these other drivers, and we can see that changing solar output for example can't be driving the current warming.