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'When people say "the climate has changed before," these are the kinds of changes they're talking about. '
xkcd: Earth Temperature Timeline
Posted from xkcd.com
Climate Change
Science
World History
Strategy
Posted 8 y ago
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Convincing people of something they don't want to believe is no easy task.... even when the vast majority of Climate Scientists are supporting your position. I doubt we will be able to have any real impact on curbing carbon emissions until the effects of climate change are clearly hitting the fan in North America.
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SSG (Join to see)
SSG John Thornton - It would be interesting to see China and India taking the lead on an environmental issue.
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SSG (Join to see)
SSG John Thornton - China and India are still in the process of developing a lot of their infrastructure... so they will likely take the lead when it comes to investment in carbon friendly/responsible development. They could also take the lead on pushing organizations like the UN and WTO to penalize nations like the US who have per capita emissions at such high rates.
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Climate change evidence: How do we know?
The current warming trend is very likely mostly human-induced and proceeding at an unprecedented rate in the past 1,300 years.
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The cartoon depiction on the link is fun, but I can't see the reference source material. This one is from GreenWorldTrust.org.uk showing GISP2 data (Greenland ice core) by Alley, 2000.
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Col Joseph Lenertz
SSG John Thornton - I agree, but neither is the xkcd image. No temp record or thermometers existed for most of the timeframe. It's all proxied up, to modify a military phrase.
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SGT Mary G.
Geologists have very accurately deduced paleoclimates, worldwide, throughout earth's history, and continue to add research data and fine-tune correlation of data.
Because so much is known about paleocliimate everywhere on earth, an accurate chart for the past 20,000 is relatively easy - a lot of work, but easy to accurately present.
The data comes from things like knowledge of past continental alignments, ocean currents and chemistry, wind currents, astronomical data, the fossil record - both oceanic and crustal which we find in the rock record tells a lot about climate because of the environment we know the flora and fauna require to thrive - types of pollen tell us a lot about temperature, soil chemistry, precipitation, and wind patterns - when found in ice core samples; volcanism and bolide impact evidence also are in the rock record and reveal changes that correlate with fossil evidence.
Long story, short, 20,000 years is really only a very short time ago, geologically, so the correlated abundant data results in accurate knowledge of worldwide paleoclimates.
If I had to guess when geological knowledge of paleoclimates reaches an increased margin of error and gets iffy, it is probably not until around about 2billion years ago and beyond!
Because so much is known about paleocliimate everywhere on earth, an accurate chart for the past 20,000 is relatively easy - a lot of work, but easy to accurately present.
The data comes from things like knowledge of past continental alignments, ocean currents and chemistry, wind currents, astronomical data, the fossil record - both oceanic and crustal which we find in the rock record tells a lot about climate because of the environment we know the flora and fauna require to thrive - types of pollen tell us a lot about temperature, soil chemistry, precipitation, and wind patterns - when found in ice core samples; volcanism and bolide impact evidence also are in the rock record and reveal changes that correlate with fossil evidence.
Long story, short, 20,000 years is really only a very short time ago, geologically, so the correlated abundant data results in accurate knowledge of worldwide paleoclimates.
If I had to guess when geological knowledge of paleoclimates reaches an increased margin of error and gets iffy, it is probably not until around about 2billion years ago and beyond!
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SGT Mary G.
Thank you SSG John Thornton for pointing out where the citation of source is located.
Interesting chart Col Joseph Lenertz from Greenland ice for the past 3000 years.
There is some talk about a big solar minimum that some expect to decrease temperatures woldwide for at least a decade. I'm dubious about the speculation. Would be interested to know what astronomers and geologist have to say about it.
Interesting chart Col Joseph Lenertz from Greenland ice for the past 3000 years.
There is some talk about a big solar minimum that some expect to decrease temperatures woldwide for at least a decade. I'm dubious about the speculation. Would be interested to know what astronomers and geologist have to say about it.
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