Good catch. The study says 0.01C/100 yearschucky wrote: ↑Sat Feb 18, 2017 3:59 pmNot 7.0ºC, not even close.evilconempire wrote: ↑Sat Feb 18, 2017 2:58 pmIdk what are you missing? What was 7k years ago? The warmer mid-Holocene era. You're saying it wasn't that much warmer?chucky wrote: ↑Sat Feb 18, 2017 2:38 pmevilconempire wrote: ↑Sat Feb 18, 2017 2:30 pmIt doesn't say for a hundred years. Lolchucky wrote: ↑Sat Feb 18, 2017 2:25 pmNot for the whole trip no. Another thing the article says "For 7,000 years, global temperatures declined at a rate of 0.1ºC (0.18ºF) per century until the start of the Industrial Revolution" so are they saying the planet was 7.0ºC warmer 7,200 years ago than it was in 1800 ? That sounds wrong to me .evilconempire wrote: ↑Sat Feb 18, 2017 12:05 pmIf your average rate for that 28 minutes was 60 mph then you couldn't say that your average rate was 60 mph?chucky wrote: ↑Sat Feb 18, 2017 11:46 amI do but if I only drive it for 28 minutes after having driven 40 for the previous 32 minues I wouldn't say my average speed over the last hour was 60 miles an hour. To get the century rate you need to go back a 100 years and then tell us what the rate was otherwise cherry picking statistics causes them to lose their meaning.evilconempire wrote: ↑Sat Feb 18, 2017 11:07 amYou realize you can drive 60 miles an hour without driving for an hour, yes?chucky wrote: ↑Sat Feb 18, 2017 11:04 am"Over the last 45 years, however, warming has taken place at a rate of 1.7ºC (3.0ºF) per century. " What ?evilconempire wrote: ↑Sat Feb 18, 2017 9:26 amThe Earth's climate has changed 170 times faster in recent years than the previous 7,000. This is just one example where human influence is overwhelming the geological and biological processes that dominated previously.
For 7,000 years, global temperatures declined at a rate of 0.1ºC (0.18ºF) per century until the start of the Industrial Revolution, note Owen Gaffney of Stockholm University and Professor Will Steffen of the Australian National University in The Anthropocene Review. Over the last 45 years, however, warming has taken place at a rate of 1.7ºC (3.0ºF) per century. These figures are based on extensive previous work – Gaffney and Steffen highlighted the ratio, rather than conducting the studies.
The authors also put this comparison in context, placing it within a longer sweep of time and among other global changes.
Although the Holocene era since the end of the last Ice Age was fairly stable until humans started mucking with the thermostat, the Quaternary (or last 2.6 million years) has seen unusually large and frequent swings in planetary temperature compared to Earth's history. Steffen explained to IFLScience that this was predominantly the result of the amplifying effect of expansion and retreat by the Northern Hemisphere ice cap.
Consequently, the paper notes: “%$#@#$ sapiens evolved during a rather unusual state of potential instability in Earth’s history.” In another era, we might have been able to mess around with the planet's atmosphere without such severe climatic consequences.
Even during the last great warming event, the Paleocene-Eocene Thermal Maximum 56 million years ago, when billions of tonnes of methane was released from oceanic hydrates, Steffen said temperatures rose at a tenth their current rate.
All along, the rate of change was a function of astronomical forces such as the tilt of the Earth's axis, geophysical forces like volcanic eruptions, and internal dynamics, including the way biological systems responded to these two. Today, human influences overshadow them all.
“We are not saying the astronomical forces of our Solar System or geological processes have disappeared, but in terms of their impact in such a short period of time they are now negligible compared with our own influence,” Steffen said in a statement. The paper argues that the Anthropocene began in 1950, when human forces outstripped natural ones.
Climate is far from the only area where human influence is staggeringly rapid. “For biodiversity, typical rates of background extinction are estimated to be around 0.1 extinctions/million species years," the paper notes. "Current extinction rates are estimated to be tens to hundreds of times higher than natural background rates of extinction."
Similarly, biological processes have been turning nitrogen gas into reactive nitrogen for billions of years, but humans have doubled the concentration since the invention of the Haber-Bosch process a century ago.
By Stephen Luntz
Let me know if you figure it out
7,000 years is 70 centuries times .1ºC = 7.0ºC what am I missing ?
Are you a Gorebot? A Denier? Let's mix it up here and figure this issue out!
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