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Note this timeline is not to scale! According to this study, after warming up 0.2° C per year for the last 3 decades, the Earth is now the hottest it's been in the last 12,000 years:
* James Hansen, Makiko Sato, Reto Ruedy, Ken Lo, David W. Lea, and Martin Medina-Elizade, Global temperature change, Proc. Nat. Acad. Sci. 103 (2006), 14288-14293.
The current temperature matches the "Holocene maximum", a warm period about 12,000 years ago, right before the last ice age. If the temperature goes up another 1°C, it'll be the hottest it's been in the last 1.35 million years!
Originally posted by poet1b
Let's put up some legitimate temperature charts.
Follow this link, half way down the page is a chart of Earth's temperature record for the last 1.35 million years. The planet's temperature increase is still accelerating.
If you do more research, you will find that the last few years have been hotter than it has been for about 400,000 years.
The Milky Way Galaxy's Spiral Arms and Ice-Age Epochs and the Cosmic Ray Connection
Originally posted by Phage
It is important to remember that correlation does not imply causation. While the causative action of greenhouse gases is understood, there's still a lot going on that we don't know about.