Global warming.
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Charlie Hatchett wrote:Lifted this from the HNs genetics thread.How about different races vs. different species, each naturally selected for the particular environment in which they lived. Note that Hss enters Europe after the Illinoisan Glacial, and probably during, or slightly after the Sangamon Interglacial Maximum (adaptation takes time). HNs was perfectly suited, or naturally selected, for the cold environment in Europe, during the Illinoisan. Then we see the dominance of Hss during the warmer periods, though small populations of "pure" HNs remain well into the Wisconsin. Global warming... All the southern peeps heading north to escape the heat and drought of the Sangamon? Hss and HNs intermingle. Hss migration to Europe and the Sangamon seem fairly linked.
Something to ponder?
Beagle wrote:Yeah Charlie, I buy that. During climate change (which has always been occuring), humans, animals, and plants all move to better ground. Then intermingling, competition, and adaptation happen. It's like a big dance that's been going on for millions of years.
I've just posted a better version of this so that you can make out the diagram on the right better.. essentially I think Jan is saying the same thing based on the lithic evidence....
http://homepage.ntlworld.com/richard.wi ... rm011b.jpg
Richard
www.palaeoart.co.uk
www.palaeoart.co.uk
http://www.missoulian.com/articles/2006 ... out_41.txt
Some cool pictures comparing montanas glaciers of today to pics taken in the early 1900's.
Some cool pictures comparing montanas glaciers of today to pics taken in the early 1900's.
http://news.bbc.co.uk/2/hi/science/nature/6196804.stm
The article calls for an end to the warfare between scientists on the issue of global warming.Climate sceptics" would do society a favour, argues our environment correspondent Richard Black, if they would open their claims to scrutiny that science is biased against them.
IN the early 1900s we were not long out of the Little Ice Age. It's a bit like comparing snow cover in March with snow cover in September ..... What we need to to see if what those glaciers looked like before they readvanced during the LIABruce wrote:http://www.missoulian.com/articles/2006 ... out_41.txt
Some cool pictures comparing montanas glaciers of today to pics taken in the early 1900's.
Anyone know where Plato left his time machine?
Interestingly I've just been reading some old National Geographics from the 70s, and one of them has an artical about Glacier Bay in Alaska, showing how some of the glaciers have retreated many miles and how others have advanced. Some of the illustrations show that the retreat was in operation nearly 300 years ago, well before CO2 was assumed to be a problem.
The artical differentiates between 'temperate' glaciers and Arctic/Antarctic glaciers and states that 96% of the ice is in the Arctic/Antarctic glaciers and that the temperate ones are always shrinking/expanding.
In addition it shows that some of the worlds largest coal fields are in the antarctic and it has been many times in the past predominantly ice free.
One part that particularly struck me was the fact that previous warming spells, such as now, seem to have occured very rapidly with the 'hockey stick' well to the fore.
The artical differentiates between 'temperate' glaciers and Arctic/Antarctic glaciers and states that 96% of the ice is in the Arctic/Antarctic glaciers and that the temperate ones are always shrinking/expanding.
In addition it shows that some of the worlds largest coal fields are in the antarctic and it has been many times in the past predominantly ice free.
One part that particularly struck me was the fact that previous warming spells, such as now, seem to have occured very rapidly with the 'hockey stick' well to the fore.
http://www.csmonitor.com/2006/1208/p01s ... html?s=itm
From: The Daily GrailWith alarms bells over global warming ringing ever louder and more insistent, is it possible - or credible - for an active scientist working on climate questions to be skeptical of the cause or future severity?
Amid mounting evidence that temperatures are rising on planet Earth, the "skeptics" and "agnostics" are a smaller band than they used to be. Yet those who do still harbor doubts about a looming global-warming crisis are quietly continuing to test alternative ideas about how climate works and what, if not the burning of fossil fuels, might be causing the temperature creep.
http://www.theepochtimes.com/news/6-12-6/48998.html
Here you go Digit.WASHINGTON—A giant black hole displaying horrifying table manners has been caught in the act of guzzling a star in a galaxy 4 billion light-years away, scientists using an orbiting NASA telescope said on Tuesday.