Below is the Grande chart in 10,000 year steps. Greenland shows rhythmic 10C degree swings on a fine time scale with the last uptick about 9000 years ago when the glaciers that had been covering Canada (up to a mile deep in the Okanagan area) had mostly disappeared. Back then the Haida were migrating by land from the Prince Rupert area to Haida Gwai. Think about it. Obama had the gall to talk about causing seas to fall. The IPCC has the arrogance to elevate our puny presence above the sun, the seas and the currents of magma far below our feet. It's like a primitivist belief in magic that our incantations cause the rain to fall, the crops to grow and pestilence to disappear. The next ice age is about to start.
How do they know this stuff? A little bit of the water vapour in the air is formed with heavy hydrogen, a rather rare but naturally-occurring form of hydrogen. (They collect it and use it for cooling some nuclear reactors). The amount of heavy hydrogen being formed in the atmosphere goes up and down with the temperature of the air. A core drilled down over 11,000 feet in Greenland went through ancient layers of ice. Testing that ice to see what percent included heavy hydrogen produced the graph.
Further reading: The “solutions” prescribed to solve both Global Warming and the looming Ice Age are exactly the same. "In both cases, proponents of the theory-du-jour say that in order to stave off disaster, we must reverse the march of civilization, stop our profligate use of carbon-based fuels, cede power and money from the First World to the Third World, and wherever possible revert to a Luddite pre-industrial lifestyle".