Allan Takes Aim Blog

Man is part of the environment

Posted on: 19 February 2013


 Man is part of the environment

 As I am part of the environment I know some readers don’t share my scepticism about global warming.  Butt share it or not, whilst I believe anthropogeniic activity plays a mall role in increased levels of CO2. it is not the role that some scientists and others without an appropriate scientific background say it does.

This article is sourced from a paper titled: “Fluctuating environment may have driven human evolution” written by a research team – funded by the National Science Foundation- from Penn State and Rutgers University in the USA and published December 24th, 2012, working In the Olduvai Gorge in Tanzania, spells out some of my reasons.  While not a comprehensive rebuttal or total debunking of the science is settled argument about global warming, it helps bring it into question.

Writing in the Proceedings of the National Academy of Sciences, Clayton Magill (a double PhD graduate student, one of the team of researchers that produced the paper said: “The landscape early humans were inhabiting transitioned rapidly back and forth between about five to six times during a period of 200,000 years. “These changes happened very abruptly, with each transition occurring over hundreds to just a few thousand years.” These findings appear to contradict previous theories which suggest evolutionary changes were gradual, and in response to either long and steady climate change or one drastic change.”

Another member of the team Penn State Professor of Geosciences Katherine Freeman says: “A series of rapid environmental changes in East Africa roughly 2 million years ago may be responsible for driving human evolution. There is a view this time in Africa was the ‘Great Drying,’ when the environment slowly dried out over 3 million years,” adding, “But our data show that it was not a grand progression towards dry; the environment was highly variable.”

The research team used gas chromatography and mass spectrometry to determine the relative abundances of different leaf waxes and the abundance of carbon isotopes for different leaf waxes. The data enabled them to reconstruct the types of vegetation present in the Olduvai Gorge area at very specific time intervals.

The results showed that the environment transitioned rapidly back and forth between a closed woodland and open grassland. To find out what caused this rapid transitioning, the researchers used statistical and mathematical models to correlate the changes they saw in the environment with other things that may have been happening at the time, including changes in the Earth’s movement and changes in sea-surface temperatures.

“The orbit of the Earth around the sun slowly changes with time,” said Freeman. “These changes were tied to the local climate at Olduvai Gorge through changes in the monsoon system in Africa. Slight changes in the amount of sunshine changed the intensity of atmospheric circulation and the supply of water. The rain patterns that drive the plant patterns follow this monsoon circulation. We found a correlation between changes in the environment and planetary movement.” The team also found a correlation between changes in the environment and sea-surface temperature in the tropics.

“We find complementary forcing mechanisms: one is the way Earth orbits, and the other is variation in ocean temperatures surrounding Africa,” Freeman said.

It seems to me that what Magill, Freeman and other respected scientists and members of the research team said, illuminates deficiencies in IPCC models based on information produced by a select group of similarly minded climate scientists for  soi –disant environmental groups that separate man from the environment.

The fact that man has managed to survive the various environmental catastrophes suggests to me they will survive the catastrophes predicted by global warming alarmists

Blog: Allan Takes Aim; https://donallan.wordpress.com; dca@netspeed.com.au 

 

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