So reads the headline in today’s Ottawa Citizen. 3.5 million years ago, before the current ice age, during the Pliocene Warming, forests reached as far north as Ellesmere Island. Forest-dwelling camels, 30% larger than today’s hot-climate camels, chewed their cuds at latitude 70 degrees.
Wikipedia informs us that:
The global average temperature in the mid-Pliocene (3.3 mya – 3 mya) was 2-3°C higher than today, global sea level 25 m higher  and Northern hemisphere ice sheet ephemeral before the onset of extensive glaciation over Greenland that occurred in the late Pliocene around 3 Ma
Further reading into Ellesmere Island shows that, 55 million years ago, the place was covered in part with large sequoia-like conifers more than 3 feet across at the base.
It cannot be said often enough. Global warming – if indeed it is actually occurring – is bringing us back to the climate the world has known for 80% of its history. Global warming is getting us out of our current lingering ice-age.
Hence I have come to believe people who complain of global warming are about on par with people who claim the French are sending abuse at them through toasters. Only their paranoia is socially approved of, whereas the poor fellow who thinks devices are beaming abuse at him, well, he is a nut case .