re: #15 Lawrence Schmerel

The issue here is that climate deniers have pointed to higher temperatures in Greenland ice cores and decried that this local data is indicative of higher global temperatures in the past. What Sinclair is saying is that 1) higher historical temps in Greenland were countered by lower temps in the southern hemisphere, and 2) One must look at the average temperature readings from multiple lines of evidence. When you do that, while Greenland may have demonstrated higher average temps, the global temps were much lower.
It is the same as someone saying that because it was a bit colder in New England this year, global climate change is a hoax, particularly since average global temperatures might be much higher. Local does not mean global.